Rear brakes problem
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Joined: May 2014
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Rear brakes problem
Hey guys. I bought a 99 C5 A4 corvette earlier in 2014, changed disk and pads on all 4 wheels as soon as I got it. I never drove any other corvette before mine so I don't know if it brakes weakly or not. My problem is this : Got car out of the garage for a quick drive and while stopped on really slippery surface ( snow + really cold + summer tires ) I noticed my rear wheels were turning even while holding the brakes firmly.... I know my idle is a bit sticky ( 1100 RPM ) but would that be sufficient enough to turn the wheel even with the brakes ON or do I really have a problem?
Thanks.
Thanks.
Melting Slicks
Joined: Sep 2011
Posts: 2,258
Likes: 543
From: Appleton WI
You have a problem. There should be no reason your brakes cannot hold the wheels still at idle. First things I would do is ensure your brake fluid reservior is filled and consider bleeding the brakes.
Drifting
Joined: Sep 2009
Posts: 1,719
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From: cinnaminson n.j.
St. Jude Donor '14
No offense, but I disagree with parts of post 2. It takes very little pedal effort to keep a car stationary on a reasonably level road. Front brakes always apply 1st. How hard were you on the pedal? I have two suggestions.
Bleed the brakes as mentioned above.
Check and verify the calipers slides can move freely.
Bleed the brakes as mentioned above.
Check and verify the calipers slides can move freely.
Tech Contributor
Joined: Oct 1999
Posts: 41,036
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From: Charlotte, NC (formerly Endicott, NY)
It sounds like you have a problem. It depends on several things. What replacement pads did you use and did you burnish them in after installation.
I have seen other high torque rear wheel drive cars do the same thing on slippery surfaces. Especially, when they are on the fast idle warm up setting. The rear brake pressure on early C5s was determined by the bias valve located at the Master Cylinder and the amount of pressure being applied to the rear is a lot less than what is being applied to the front. Could you stop the rear wheels from spinning by pushing harder on the brake pedal?
Bill
I have seen other high torque rear wheel drive cars do the same thing on slippery surfaces. Especially, when they are on the fast idle warm up setting. The rear brake pressure on early C5s was determined by the bias valve located at the Master Cylinder and the amount of pressure being applied to the rear is a lot less than what is being applied to the front. Could you stop the rear wheels from spinning by pushing harder on the brake pedal?
Bill
Melting Slicks
Joined: Sep 2011
Posts: 2,258
Likes: 543
From: Appleton WI
No offense, but I disagree with parts of post 2. It takes very little pedal effort to keep a car stationary on a reasonably level road. Front brakes always apply 1st. How hard were you on the pedal? I have two suggestions.
Bleed the brakes as mentioned above.
Check and verify the calipers slides can move freely.
Bleed the brakes as mentioned above.
Check and verify the calipers slides can move freely.
I agree the front brakes will hold more firmly in proportion to the rears. I still think the brakes should overpower the torque at the indicated RPM. One way or another, investigation wouldn't hurt.
Thread Starter
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Joined: May 2014
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Tried again today with girlfriend in car while in drive and I was looking. Even with more pressure applied wheels kept turning so I will take further investigations. Maybe my vette is supposed to brake way more than it is already now and I'll be amazed next summer !
