C3 Brakes - Help
Thread Starter
Instructor
Joined: May 2006
Posts: 118
Likes: 0
From: Sydney NSW
C3 Brakes - Help
Have had a brake specialist do almost total re build to fix my brakes.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Safety Car
Joined: Jan 2008
Posts: 3,795
Likes: 435
From: Aarhus, Denmark
Have had a brake specialist do almost total re build to fix my brakes.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Air for sure........
Try bleeding again, start with right rear wheel.
Intermediate
Joined: Jun 2008
Posts: 33
Likes: 0
Have had a brake specialist do almost total re build to fix my brakes.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Calipers re sleeved (stainless), booster re kitted, new rotors, new pads, re cond master (now around 2 years ago), blead 4 times but still after 3 weeks a firm brake pedal is spongy and travels way too far to pull up.
Air in the lines?
Hoses not changed as they look OK!
Any suggestions welcomed.
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
By all means try bleeding the brakes again... 
However if they again turn spongy in short order you will want to check your rotor run-out. It's not uncommon to run into issues with rotor run-out when installing new rotors these days.
There are a number of ways to address it, if you do a search you'll probably find a bunch of threads on it.
Good luck... GUSTO
However if they again turn spongy in short order you will want to check your rotor run-out. It's not uncommon to run into issues with rotor run-out when installing new rotors these days. There are a number of ways to address it, if you do a search you'll probably find a bunch of threads on it.
Good luck... GUSTO
Team Owner
Joined: Sep 2006
Posts: 31,283
Likes: 4,373
From: Westminster Maryland
Hi P,
Are you driving the car some during those 3 weeks?
If you are, it sounds like the rear rotors are pumping air into the rear calipers and they need to be checked with a gauge and shimmed for 'run out'.
Since you did all that work on the brakes I think changing the rubber lines would have been a good thing to do while everything was apart. I don't know how much you can judge the condition of a rubber line by appearance. Perhaps they're a little porous and are letting some air in.
Getting air into the system is a problem lots of Corvette owners wrestle with.
Regards,
Alan
Gusto... you're a faster typist than I am!!!
Are you driving the car some during those 3 weeks?
If you are, it sounds like the rear rotors are pumping air into the rear calipers and they need to be checked with a gauge and shimmed for 'run out'.
Since you did all that work on the brakes I think changing the rubber lines would have been a good thing to do while everything was apart. I don't know how much you can judge the condition of a rubber line by appearance. Perhaps they're a little porous and are letting some air in.
Getting air into the system is a problem lots of Corvette owners wrestle with.
Regards,
Alan
Gusto... you're a faster typist than I am!!!
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
