1989
Melting Slicks
Joined: Jul 2003
Posts: 3,489
Likes: 868
From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
Look at the flex lines to each wheel. If they are original they should be changed. They can swell up and cause that problem. I'd start there.
Team Owner
Joined: Sep 2001
Posts: 62,125
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
An abnormally hard pedal indicates possible brake booster failure, and I'd replace with the metal one thats out there. Otherwise there is probably a vac loss somewhere.
A soft pedal usually points to a Master Cylinder, air in the lines or some leak.
A soft pedal usually points to a Master Cylinder, air in the lines or some leak.
Racer
Joined: May 2012
Posts: 272
Likes: 46
From: Tulsa OK
Probably your brake booster. Make sure the vacuum line to the booster isn't leaking or disconnected. If that's fine it's the booster its self. The rubber diaphragm inside can go bad. It is probably not the soft lines to the calipers. If those were bad your brakes would be sticking or locking up.
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 750
Likes: 86
From: St Petersburg
It probably is the booster, that my son and I can change
they look a bit pricey
my understanding that no need to bleed the breaks as long as the lines to the master stay on
they look a bit pricey
my understanding that no need to bleed the breaks as long as the lines to the master stay on
Last edited by BillDurant; Feb 8, 2021 at 12:38 PM.
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Racer
Joined: May 2012
Posts: 272
Likes: 46
From: Tulsa OK
Yes. With the car running disconnected the vacuum line at the booster. If it is pulling a strong vacuum then the diaphragm inside the booster is bad. If there is no suction at the hose then you probably have a bad vacuum line or connection.
Drifting
Joined: Aug 2002
Posts: 1,774
Likes: 125
From: Birmingham AL
No brake bleeding required. Just carefully bend the mc and lines away without disconnecting. I had to cut the booster studs down a little to fit my new OEM booster in. Try to avoid removing the cross brace above the battery. That can be problematic if the nut spins inside the frame, so I’ve heard.