hot rear brake disc - A4 - B7

[quattroorcooper]

2.0T A4 B7 Quattro

Hi everyone, hopefully someone can shed some light on my brake issue.

My rear left brake has been getting hotter than the other 3.

I have replaced the slide pins, the discs, pads and have put on a new caliper.

Brakes have been bled.

But it still appears to be much hotter than the other 3 after a drive.

What more can it be?

[fly300kts]

ABS control module

Phil

[shahk62]

How have you noticed this?


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[fly300kts]

MASTER CYLINDER -> ABS MODULE -> BRAKE LINE -> BRAKE CYLINDER

Since you change the last part, easy to deduct

Phil

[mnuttall]

Handbrake cable could be sticking.

[quattroorcooper]

How have you noticed this?


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Smell.

- - - Updated - - -

A little more info:


I first noticed 2 weeks ago when i heard scraping from the brake. on inspection the rear pad was worn to the backing plate. Though not evenly, was worn on an angle.

I fitted some new pads and suspected the slide pins had seized, so replaced them too. think that was the problem solved.

A couple of days later i noticed that the brake was hot again. So I ordered news discs think the old one could be warped. And i ordered a new caliper, since I new that side was original (all others had been changed).

Funny when i took the 2 week old pads of yesterday they were again worn uneven at an angle.

[vvenom800tt]

You probably didnt use proper high temp urea grease on the slide pins. You need to drown them in that shit

[fly300kts]

I do assume that you are using the right piston caliper tool to retract the piston?

Phil

[quattroorcooper]

You probably didnt use proper high temp urea grease on the slide pins. You need to drown them in that shit

The new pins came with the right grease, as you said they are totally covered in it.

- - - Updated - - -

I do assume that you are using the right piston caliper tool to retract the piston?

Phil

I have to tool , but didn't need to use since it was a new caliper and the piston was already fully retracted.

[vvenom800tt]

Theres a difference between brake pad grease (gray thick stuuf) and Urea (looks like clearish amber lube) which has better sliding properties for the pins. So make sure its the clear stuff on there

The pad grease is to dampen vibrations on the back of the pads, the Urea is to aid in the slide pins sliding with the least amount of friction possible.

[b7_Andy]

When you had the pads and rotor off did you see how easily the caliper can slide back and forth on the carrier? It should slide really easily. Even if the slide pins are lubed up completely they could still be pretty stuck in the bore of the carrier. I haven't taken apart any pins on Audi brakes so I forget what the rears look like, but I would pull the rotor and pads off and see how easily the caliper can slide. If it isn't sliding very easily I would take the pins and rubber boots out and clean the rust out of the bores that the pins sit in and then reassemble.


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[b7_Andy]

^ So ignore that. I just took a look at my rear brakes and I was definitely confusing my car with another one I worked on. But definitely check how freely the caliper can move and that will tell you whether the slide pins are the problem or not.


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[vvenom800tt]

If the pads are worn at an angle the only possible reason is a sticking slide pin