A Reoccurring Brake Issue
Thread Starter
Heel & Toe
Joined: Dec 2022
Posts: 22
Likes: 3
A Reoccurring Brake Issue
So about a month ago some of the wonderful folks on this forum helped me solve my squishy brake issue (thank you again)
However, unfortunately it is back. I put her away about a month ago (brakes were great) took her back out today for the first time and I noticed throughout the drive I was losing pressure. By the time I got home the pedal was going to the floor.
One key note this time: I noticed a little fluid leaking close to the brake booster but I cannot narrow down where it’s coming from
Last time (a month ago) I used a pressure bleeding system and it worked great! I found a lot of air in the lines which obviously leads me to believe there’s air in the lines once again, so I guess we have to answer how it’s getting in there….
However, unfortunately it is back. I put her away about a month ago (brakes were great) took her back out today for the first time and I noticed throughout the drive I was losing pressure. By the time I got home the pedal was going to the floor.
One key note this time: I noticed a little fluid leaking close to the brake booster but I cannot narrow down where it’s coming from
Last time (a month ago) I used a pressure bleeding system and it worked great! I found a lot of air in the lines which obviously leads me to believe there’s air in the lines once again, so I guess we have to answer how it’s getting in there….
Burning Brakes
Joined: Dec 2017
Posts: 1,043
Likes: 414
2023 C3 of the Year Finalist - Modified
Anytime there is a leak, air will get into the system.
pressure is applied, some leaks out, when that pressure is removed, air is sucked in it’s place.
find and fix the leak and then rebleed.
having someone sit in the car and mash the brakes while you look should reveal where it’s coming from.
pressure is applied, some leaks out, when that pressure is removed, air is sucked in it’s place.
find and fix the leak and then rebleed.
having someone sit in the car and mash the brakes while you look should reveal where it’s coming from.
Le Mans Master
Joined: Aug 2005
Posts: 6,539
Likes: 1,971
From: Temple Terrace Florida
Sounds like your master cylinder is going south. Make sure the fluid is not from the cap. Also check all the wheels to see if a caliper is leaking. Lastly, use a dial indicator on the rear rotor to measure run out. Should be less than .005. Less than .003 would be better. Excessive run out could cause the rotors to pump air into the calipers. Jerry
Thread Starter
Heel & Toe
Joined: Dec 2022
Posts: 22
Likes: 3
Sounds like your master cylinder is going south. Make sure the fluid is not from the cap. Also check all the wheels to see if a caliper is leaking. Lastly, use a dial indicator on the rear rotor to measure run out. Should be less than .005. Less than .003 would be better. Excessive run out could cause the rotors to pump air into the calipers. Jerry
thats great advice thank you Jerry. Follow up question, and I can start another thread if I need to. But where would you buy new rotors from? I’m just thinking my local auto parts store but anywhere you would suggest online that’s better?
Melting Slicks
Joined: Sep 2005
Posts: 2,710
Likes: 901
From: Warminster PA
Visual inspection of all calipers / pistons and line fittings is in order to look for any evidence of brake fluid. Check the seal at the rear of the master cylinder (where the pushrod engages the piston in the master). You'll need to remove the master from the firewall (or booster) to inspect.
Supporting Vendor
Joined: Jul 2007
Posts: 31,071
Likes: 406
From: Raleigh NC
Leaking brake fluid is never a good sign in any car and will cause squishy brakes.
See if you can spray down the mess that's been made with brake cleaner (protect your paint) and then get someone to step on the brake pedal in the car while watching for where the leak might be coming from.
We specialize in mainly newer Vette's but the same principals apply.
Hope you can find the leak and get the confidence back in your brakes.
I've been in the situation with my dad's 39' dodge and 56' new yorker where you never know if the brakes are going to stop the car coming down a hill, thrilling but not in a good way!
--Aaron
See if you can spray down the mess that's been made with brake cleaner (protect your paint) and then get someone to step on the brake pedal in the car while watching for where the leak might be coming from.
We specialize in mainly newer Vette's but the same principals apply.
Hope you can find the leak and get the confidence back in your brakes.
I've been in the situation with my dad's 39' dodge and 56' new yorker where you never know if the brakes are going to stop the car coming down a hill, thrilling but not in a good way!
--Aaron
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