[C2] 1965 Leaking Brakes
07-22-2018, 07:15 AM
#1
Safety Car
Thread Starter
Member Since: Apr 2013
Location: Arlington TX
Posts: 4,833
Received 931 Likes
on
533 Posts
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
1965 Leaking Brakes
When I bought my 65 a year ago the left front and rear brakes leaked. The calipers looked great so I replaced the seals. About 6 months later, the rear one started leaking again. Disassembly shows the stainless steel sleeves to be good, but didn’t want to risk it again, so ordered a new caliper which I will install today.
Anybody have a recurring problem like this? Bad seals, leaking past sleeve, etc.?
Anybody have a recurring problem like this? Bad seals, leaking past sleeve, etc.?
07-22-2018, 07:30 AM
#2
Melting Slicks
Do your calipers have the lip seals or were they changed to o-rings?
07-22-2018, 07:37 AM
#3
Drifting
That is a recurring problem I had until I changed to O rings,
07-22-2018, 07:47 AM
#4
Le Mans Master
Check the rotor run out on the rear rotors. If it exceeds .006 you may be pumping air into the system which could cause your leak. I installed O-ring pistons and seals on both my 66 and 68 coupes years ago and have not experienced any problems. Do a search as this topic has been discussed many times. Jerry
The following users liked this post:
59BlueSilver (07-22-2018)
07-22-2018, 08:16 AM
#5
Tether Man
Member Since: Dec 2004
Location: Pittsburgh, South Hills
Posts: 4,537
Received 2,014 Likes
on
1,039 Posts
2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
Check the rotor run out on the rear rotors. If it exceeds .006 you may be pumping air into the system which could cause your leak. I installed O-ring pistons and seals on both my 66 and 68 coupes years ago and have not experienced any problems. Do a search as this topic has been discussed many times. Jerry
07-22-2018, 08:29 AM
#6
Team Owner
Member Since: Mar 2003
Location: Greenville, Indiana
Posts: 26,118
Received 1,843 Likes
on
1,398 Posts
When I bought my 65 a year ago the left front and rear brakes leaked. The calipers looked great so I replaced the seals. About 6 months later, the rear one started leaking again. Disassembly shows the stainless steel sleeves to be good, but didn’t want to risk it again, so ordered a new caliper which I will install today.
Anybody have a recurring problem like this? Bad seals, leaking past sleeve, etc.?
Anybody have a recurring problem like this? Bad seals, leaking past sleeve, etc.?
New seals, new pistons and new SS bores should be leak free for years.
07-22-2018, 08:46 AM
#8
Melting Slicks
07-22-2018, 08:52 AM
#10
Melting Slicks
07-22-2018, 08:58 AM
#11
Race Director
The following users liked this post:
59BlueSilver (07-22-2018)
07-22-2018, 10:40 AM
#12
Le Mans Master
Member Since: Nov 2015
Location: Really Central IL Illinois
Posts: 5,207
Received 1,534 Likes
on
1,036 Posts
We had the same problem with R66. Both rear calipers leaked when the car set in the winter unless I pumped the brakes once a week. I rebuilt the calipers with new lip seals. The calipers appeared to be SS sleeved. Still had the weep when the car set. Drove the car on a 200 mile + cruise and the right rear caliper locked up. Removed the caliper and checked the runout on the disc and found it within spec. Finally disassembled the caliper again and found it was over bored beyond GM specs. The pistons were rocking in the bore and sucking in air as well as not releasing. I had not checked the bore ID when I rebuilt them.
We replaced both rear calipers with o-ring calipers from Lone Star. Eliminated the problem.
We replaced both rear calipers with o-ring calipers from Lone Star. Eliminated the problem.