Rear disc problems.

I got a full set of Grooved discs, 2-peice fronts along with PF pads from Ian at Godspeed. It was only when it came to fitting them that it became apparent that the rears are not the same as the previous STIs, only 64mm high against the 68mm previously. During this I noticed that the inside face of the rear disc was badly marked, which I had not noticed previously as the outside face looked fine. I called Ian but he could not get the newer discs from his supplier but did offer to groove discs I supplied for £60 to match the fronts when I got them.

Due to the wear I started looking but could not find anything plain or grooved. One guy took my Reg number and said he could get them but they turned out to be WRX discs. I went to Subaru and was told they were £500 a pair and they could not say if they were in stock or not.

At the second service I was told that the discs were at the end of their life so I spoke to Ian and he told me that he would try Prodrive to see if they had any from their rally builds. He managed to get a pair, delivery mileage only and groove them for me and they are now fitted.

Moral of the story, check your rear discs as I didn’t expect them to be worn out after only two years of road work with standard pads. If they are then you may struggle to find replacements as it appears that the aftermarket didn’t expect them to have worn out this soon either.

Paul.

How many miles did you get out of the discs ??

14K and still about half of the original pad left.

Jesus Christ thats bad, any reason found for it ?? mines on 29,500 and discs are still spot on all round

Nothing I can see and it's the same on both sides, which is what makes me think it's not just a one off problem. Prosport just serviced it and apart from the state of the discs gave it the all clear.

My brakes at the rear have been making some dodgy noises so I took the car in and they said the pads were work and have damaged the discs.

I wish they would have told me that 2 weeks before when they checked the discs for the first time.

Result being they said I need new rear discs and pads at a cost of £600.00. WTF !!! Surely not

Manchester_Kris wrote:My brakes at the rear have been making some dodgy noises so I took the car in and they said the pads were work and have damaged the discs.

I wish they would have told me that 2 weeks before when they checked the discs for the first time.

Result being they said I need new rear discs and pads at a cost of £600.00. WTF !!! Surely not

Which garage are you using Kris ??

mickp wrote:

Manchester_Kris wrote:My brakes at the rear have been making some dodgy noises so I took the car in and they said the pads were work and have damaged the discs.

I wish they would have told me that 2 weeks before when they checked the discs for the first time.

Result being they said I need new rear discs and pads at a cost of £600.00. WTF !!! Surely not

Which garage are you using Kris ??

Hi mate, I took it to Subaru Rochdale.

Revolution have EBC standard rear discs for the 08+ STi listed on their just-subaru website for £99.99 a pair.

HTH, Neil

Right I'll step in here and clear up why these rear discs are causing problems from my experience's working with them day in day out.

As part of PDI on any new subaru I allways make a point of removing the wheels and polishing up the discs as some of them have quite heavy surface corrosion, which in turn make the pads wear un even and causes big grooves or ridges in the discs over a period of time. I suspect allot of dealers cant be arsed to do this so would rather the customer foots the bill when these wear out prematurly.

Hope this clears some of the matter up

Brake pads now off. Pads ultra worn.

I put a set of Ferodo DS2500 on and it feels great now

Kris, whats the part number for the pads you put in? How much were they? Where did you get them? Hopefully its the front as thats what I need.

Just had to put new rear discs and pads on my WRX.
Had to get them from the local stealers at £259!!

The original ones (22,000miles) were absolutely shot on the back side of the discs (the side you can't see!!) and the corresponding pads were very badly/unevenly worn.

New brakes make a massive difference but I'm very dissapointed (yet again) in Subaru's quality.

or should that be

The pictures don't really show how bad my brakes were...





They were bad!

Very uneven pad wear, a sticky piston?

both sides (passenger and driver)were identical which would mean both pistons sticking. That would explain the poor braking performance I had. Although both pistons moved easily when I tried them so not sure ???

Sticky Pads in the caliper Slides, That and a combination on poor cleaning of the braking surface on PDI when the car was new

Rob, yeah, that could be it I think.

The outer (visible) side of the discs looked ok, as the pads did to. Just the inner (Piston) side had the bad wear.

Just out of the warranty period too !

Noted a bit of squeaking from the rear when i first set off. Sounds like the rear handbrake pads may be sticking slightly.

Is this an easy one to sort anyone ??

mickp wrote:Noted a bit of squeaking from the rear when i first set off. Sounds like the rear handbrake pads may be sticking slightly.

Is this an easy one to sort anyone ??

remove the rear wheels.
Unbolt the rear brake caliper 17mm socket and 1/2 drive ratchet and hang to one side not on the hose I may add.
Remove the rubber plug on the disc and locate the adjuster, usually bottom side and slacken the adjuster off then fit two 8mm bolts into the disc and jack it off

then your basically inside the drum assy for the handbrake. usually I dismantle the whole lot and clean up everything and give them a little shot of grease out of a spray can on the pivots and fire some up the cable boot too, then reassemble and adjust the adjuster until the disc cant be tuned and then back off 4 notches and job done.

Thanks once again Rob