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Have my brakes been done?

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Hi there, To cut a long story short, my dad recently bought four new brake disks, pads and sensors to completely replace the brakes on my car. My dad took the car "to a guy he knows" who fitted al… Read More
shaunp Avatar
4m, 1w agoPosted 4 months, 1 week ago
Hi there,

To cut a long story short, my dad recently bought four new brake disks, pads and sensors to completely replace the brakes on my car. My dad took the car "to a guy he knows" who fitted all the parts for £100. The brakes got fitted about 1 week ago.

I carpool to work and was telling my colleagues that I got new brakes. One of my colleagues looked at my front wheels and went "Oh yeah you can see the new disks - look it's all shiny" but said that the back was rusty and it didn't look like the disks had been replaced - maybe just the pads.

I have taken pictures for you to investigate. You can see a clear difference between the front and back. The large disk on the back is shiny, but the smaller disk that attaches to the wheel is rusty.

I know absolutely nothing about cars. Have my rear brake disks been replaced?

Thanks for your help.
shaunp Avatar
4m, 1w agoPosted 4 months, 1 week ago
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(1)
100% not replaced going by that pic.

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#1
FRONT:

https://s23.postimg.org/lc5aeb2hn/IMG_2500.jpg


REAR:

https://s23.postimg.org/gc7u6cwuz/IMG_2499.jpg



Edited By: shaunp on Jan 12, 2017 18:34
#2
put your finger through the hole and feel the top of the disc if it's new there won't be a lip due to wear but if you can feel a lip then it's an old disc.
That's the easiest way of looking.
discs do get rusty quick being outside. but looking at it the rear ones look old.
#3
is your car an electronic handbrake. I bet they didn't have the tool to open the brake so just didn't do the rear
#4
srp111
put your finger through the hole and feel the top of the disc if it's new there won't be a lip due to wear but if you can feel a lip then it's an old disc.
That's the easiest way of looking.
discs do get rusty quick being outside. but looking at it the rear ones look old.

The top of the shiny bit or the rusty bit?
#5
srp111
is your car an electronic handbrake. I bet they didn't have the tool to open the brake so just didn't do the rear

Nope, manual. You use your foot to activate it. There is a lever you pull to release.

Edited By: shaunp on Jan 12, 2017 18:42
#6
Or just ask the guy that did them.
#7
top of shiny bit. the disc gets shiny due to the pads rubbing against them and wears it down. when they are new there is no wear obviously. but after a whole they wear down but leave a lip where there is no wear . if that makes sense
#8
gadger100
Or just ask the guy that did them.

A friends of my dads. I have left a message with my dad asking him if the rear definitely got done.
#9
looking at the working surface of the back disk, it looks in very good condition ( a nice smooth finish & no deep grooves)the other parts of the disk can rust & discolour very quickly. check out an older disk on another car and you will normally see deep grooving in any disk that may need replaced.
#10
Going just by the pics-id say no, they havnt replaced the rear discs. The outer disc part looks nice and smooth, but the inner part should look like the front. £100 for discs, pads and sensors sounds very cheap. A sensor alone could cost that. Or was that just the fitting price?
#11
Finger on the edge of the shiny part to see for any sort of lip, if there is a noticible lip then your rear discs probably weren't changed. The rusty part you refer to is not part of the braking surface so there's nothing to really worry about there. If you leave the car sitting for a few days the brakes will look rusty anyway which is usual as the metal has no protection from weathering and oxidation, again nothing to really worry about.

Edited By: xmadddx on Jan 12, 2017 18:51: Corrections
#12
Right so went out to the car and touched the edge of the shiny disk. It isn't a sharp edge (feels curved) but no lip sticking out.
#13
The rust i see isnt on the hub, if you look closely, its coming inside on to the smooth braking bit-and there's no way it would look like that after just 1 week.
#14
Based on the rust on the rear disks, it appears that the rear disks have not been replaced. I suggest you check the receipt for the brake parts to see how many sets of discs were actually purchased and handed over to be fitted before querying with the mechanic. Brake disks are normally sold as a front set or rear set complete while brake disks are normally sold per corner (front and rear separately).
#15
it looks like light surface corrosion. new discs come covered in a wax oil to prevent them rusting whilst sat on a shelf in cold damp warehouses. it is likely he has fully cleaned the rear discs yet the front still has the oil on where the pads dont meet the discs.

from the image they look very good condition discs. no scoring, wear marks etc. shouldnt worry
#16
Rich069
Going just by the pics-id say no, they havnt replaced the rear discs. The outer disc part looks nice and smooth, but the inner part should look like the front. £100 for discs, pads and sensors sounds very cheap. A sensor alone could cost that. Or was that just the fitting price?

My dad bought the materials separately at a cost of £210. Fitting was £100.
#17
BobIzYaUncle
it looks like light surface corrosion. new discs come covered in a wax oil to prevent them rusting whilst sat on a shelf in cold damp warehouses. it is likely he has fully cleaned the rear discs yet the front still has the oil on where the pads dont meet the discs.

from the image they look very good condition discs. no scoring, wear marks etc. shouldnt worry


but defo not replaced. The discs do look ok, but that rusting doesnt get there after 1 week.
#18
Here is another picture with the flash on:

https://s28.postimg.org/8pc9opsvx/IMG_2501.jpg
#19
The rust on the 'hat' of the brake disc is perfectly normally after a week of British driving. They are completely unprotected once cleaned and installed, brakes can gather surface rust in a day or two in wet weather, and the brake pads will remove the material but only on the friction surface.

Those discs look in very good condition, if they were like that before hand they never needed replacing anyway.
#20
100% not replaced going by that pic.
#21
adamspencer95
The rust on the 'hat' of the brake disc is perfectly normally after a week of British driving. They are completely unprotected once cleaned and installed, brakes can gather surface rust in a day or two in wet weather, and the brake pads will remove the material but only on the friction surface.
Those discs look in very good condition, if they were like that before hand they never needed replacing anyway.


But why would the front be shiny?
#22
Mercedes dealer will check your brake wear for free. Is that a C-class? Replaced my E-class brakes and pads on all 4 wheels for less than £300 at last service.
#23
and looking at the bottom of the disc, something looks bent??
#24
shaunp
adamspencer95
The rust on the 'hat' of the brake disc is perfectly normally after a week of British driving. They are completely unprotected once cleaned and installed, brakes can gather surface rust in a day or two in wet weather, and the brake pads will remove the material but only on the friction surface.
Those discs look in very good condition, if they were like that before hand they never needed replacing anyway.


But why would the front be shiny?


looks like the hats on the front discs are painted/protected as they are a different shade of silver/grey
#25
front looks new rears dont
#26
https://m.youtube.com/watch?v=3xxRg_E1kgg 34 seconds in.... looking at your pictures though, say they have been replaced.
#27
You can get rust if the brakes are not protected although it appears that the rust on the hat is a bit excessive for one week. It does look like the disc is quite clean however. Did you get a chance to see the items that were purchased before fitting as there is every chance that there could have been rust on the brakes before being fitted.

Edited By: thehitman on Jan 12, 2017 19:03
#28
shaunp
adamspencer95
The rust on the 'hat' of the brake disc is perfectly normally after a week of British driving. They are completely unprotected once cleaned and installed, brakes can gather surface rust in a day or two in wet weather, and the brake pads will remove the material but only on the friction surface.
Those discs look in very good condition, if they were like that before hand they never needed replacing anyway.


But why would the front be shiny?


because they have been. I replaced my rears about 6 months ago (15k miles) and there is no rust on mine.
#29
unless the car has stood for any amount of time, the sides are going to look shiny anyhow, as the pads rub on them...
#30
looks like old in back take the rears tire off and check them u will be able see properly if u still cant measure the thickness and see against what they should have been.
#31
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.
#32
Rich069
and looking at the bottom of the disc, something looks bent??

I went out and checked again - this is just an illusion with the flash! Nothing bent.
#33
Guys, I have checked for a lip on the outside of the disk, and there is none at the top of the disk. HOWEVER where the rusty bit joins the shiny disk, there is an indent?
#34
MIDURIX
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.

I did get a ferry to work yesterday and got hit by a fair amount of water...
#35
MIDURIX
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.


After looking at that bottom picture, you're telling me they should look like that after 1 week??
banned#36
Handbrake on the back hence rust.
#37
Rich069
MIDURIX
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.
After looking at that bottom picture, you're telling me they should look like that after 1 week??
Yes. To me the pictures look like very fine surface rust. If it's scabby flakes then absolutely not though. Some cars brake discs can rust in hours, have a search for the new Tesla car for example. Brake discs are cast iron in most cases and when open to the element for one day it can and will rust very easily.
#38
MIDURIX
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.

So the guy who fitted the disks would have painted them?

If so, why didn't he paint the back?
#39
MIDURIX
Rich069
MIDURIX
So much wrong advice. Brake disc hubs are painted at the front and unpainted at the back, so they have rusted at the back. Can rust within a few days and is noticeable on lots of new cars like Golf, A3 etc.
After looking at that bottom picture, you're telling me they should look like that after 1 week??
Yes. To me the pictures look like very fine surface rust. If it's scabby flakes then absolutely not though. Some cars brake discs can rust in hours, have a search for the new Tesla car for example. Brake discs are cast iron in most cases and when open to the element for one day it can and will rust very easily.


I dont know what discs you buy, but ive never had "painted" front discs, or discs which rust in that amount of time. If youve replaced your discs youll know they come with an oily film on them to stop them rusting etc, and to remove that from part which will be coming into contact with pads. The oily part can be left on the hub to continue to stop that part rusting. Even if that had been removed, the rust on there is excessive. No new disc should look like that after a week.
#40
Easiest way to figure it out is to go and get a free brake check at kwikfit or somewhere.
Second easiest way - how many miles had the last set of rear brake discs done? If over 10 - 15,000 miles, there will be scoring / pitting on the disc. Also as said above, there will be a lip on it.
For what my opinion is worth, they have been changed. The disc looks far too smooth to have done any mileage that would warrant changing it.
Rust is rust. The roads are covered in salt at the moment which will speed up surface rust. The reason the back might be more rusted than the front could come down to the design of the car, in that the rear gets more water / spray on it etc.
If you're mechanically minded, just pop the rear wheel off and look all around it.

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