brake expert needed
Thread Starter
Intermediate
Joined: Mar 2007
Posts: 34
Likes: 2
From: zoetermeer zuid holland
brake expert needed
Ok here is the deal that drives me crazy
Got a 76 rebuild the hole rear end every thing is new
Here is the issue that’s making me mad.
Bleed the rear caliper got a rock sold pedal sounds good right.
drive it around rock solid than when I drive over 45 miles and a longer period of time the rear breaks starts to fade only the back brakes and there are no leakages.
Put is on the bridge open up the bleeders got air ****!!
bleed it again rock solid drive it for one hour and the brakes starts to get worse and so one.
Bleed it for at least 20 times minimum with no air
rebuild a lot of brakes for customers al fine but my night mare corvette
cant seam to get it right
So this is what I was thinking the corvette brakes have a spring behind the pistons .Is it possible that when de disc aren’t running straight the pistons are moving rapidly and suck up air while driving and not operating the brakes ( I know Porsche had this issue)
Ore will a little wheel baring play end up in this problem
O and yes replaced the master cylinder.
Hope some one knows a solution to this strange problem.
Thanks ,
Leon
brake expert needed
Got a 76 rebuild the hole rear end every thing is new
Here is the issue that’s making me mad.
Bleed the rear caliper got a rock sold pedal sounds good right.
drive it around rock solid than when I drive over 45 miles and a longer period of time the rear breaks starts to fade only the back brakes and there are no leakages.
Put is on the bridge open up the bleeders got air ****!!
bleed it again rock solid drive it for one hour and the brakes starts to get worse and so one.
Bleed it for at least 20 times minimum with no air
rebuild a lot of brakes for customers al fine but my night mare corvette
cant seam to get it right
So this is what I was thinking the corvette brakes have a spring behind the pistons .Is it possible that when de disc aren’t running straight the pistons are moving rapidly and suck up air while driving and not operating the brakes ( I know Porsche had this issue)
Ore will a little wheel baring play end up in this problem
O and yes replaced the master cylinder.
Hope some one knows a solution to this strange problem.
Thanks ,
Leon
brake expert needed
Le Mans Master
Joined: Aug 2006
Posts: 7,426
Likes: 1,559
From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Thread Starter
Intermediate
Joined: Mar 2007
Posts: 34
Likes: 2
From: zoetermeer zuid holland
the spindels is the only part that I didnt replaced they looked brand new
I there a nother trick to line them up like whashers hmmm dont think that will be a good thing.!!
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Racer
Joined: Jan 2011
Posts: 266
Likes: 0
From: York Pa.
Hey Pete..you say that you replaced everything..ok does this mean bearings also..I assume so..did you get the end play down low..I assume so..that leaves the spindle and rotor runout may be a little out..I have said this on many brake posts before..but..find a Procut brakelathe and get the rotors cut on the car..I know the shim thing works but this will true the rotors to the hubs..I got one and love it..it wont take much so don't let them cut the planet off them..couple thou is all that's needed..also make sure they know about the u joint bind in the rear with the wheels off the ground..I did mine when I rebuilt the calipers and new bearings on mine..no problems at all..of course I am also assuming that you have a run out issue..
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
It's not the rotors that are not straight- it's the spindle. They weren't true from the factory, nor were the rotors. They were assembled, riveted and final machined to make them a matched set. You've tossed out half of the matched set so have to start over. Read up on rotor runout on this site.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
It's not the rotors that are not straight- it's the spindle. They weren't true from the factory, nor were the rotors. They were assembled, riveted and final machined to make them a matched set. You've tossed out half of the matched set so have to start over. Read up on rotor runout on this site.