brake problems.....help, please
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
brake problems.....help, please
i installed new calipers in my 1992 coupe, the rear are fine, the front calipers clap when i use them, every time i press the brake pedal, i hear the calipers clamp down on the rotor. when i release the brake, i hear them pull off the rotor. if work the pedal up and down real fast, but lightly, it sounds like machine gun fire.....what gives?
also, i did the richard petty experience at disney this past weekend, if your interested i'll tell how it went...
thanks in adavnce guys
doug :jester
also, i did the richard petty experience at disney this past weekend, if your interested i'll tell how it went...
thanks in adavnce guys
doug :jester
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: brake problems.....help, please (dsky)
did you grease the pin that supports the caliper?
thats all I can think off... unless the pads are not COMPLEATLY in their positions. meaning, they are off the caliper a bit.
I have done the Monster Mile here in Dover at Dover Downs... It was cool! I didn't drive, but the ride is well worth the $75.00!!!!!! :auto:
thats all I can think off... unless the pads are not COMPLEATLY in their positions. meaning, they are off the caliper a bit.
I have done the Monster Mile here in Dover at Dover Downs... It was cool! I didn't drive, but the ride is well worth the $75.00!!!!!! :auto:
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: brake problems.....help, please (bogus)
did you grease the pin that supports the caliper?
thats all I can think off... unless the pads are not COMPLEATLY in their positions. meaning, they are off the caliper a bit.
I have done the Monster Mile here in Dover at Dover Downs... It was cool! I didn't drive, but the ride is well worth the $75.00!!!!!! :auto:
thats all I can think off... unless the pads are not COMPLEATLY in their positions. meaning, they are off the caliper a bit.
I have done the Monster Mile here in Dover at Dover Downs... It was cool! I didn't drive, but the ride is well worth the $75.00!!!!!! :auto:
It sounds like you need to grease the caliper slide pins.
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
Re: brake problems.....help, please (ittlfly)
i know that i took them apart, pulled off the boots and cleaned out a lot of rust/dust and re-lubed them, but i'll doo that again this weekend.
thanks for the input
regards
doug :jester
thanks for the input
regards
doug :jester
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: brake problems.....help, please (dsky)
Just out of curiosity, do you still have the clips (can't remember their name) that attach to the end of the pads to keep them in place? If I recall, I had this same problem about 5 years ago, and it was because I didn't have the clips on the end of the pads...
Mike
Mike
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
Re: brake problems.....help, please (92TripleBlack)
there is no pad rattling, the piston actuates when the pedal is depressed (clamps down - clunk) and then the piston pulls off the rotor when i take my foot off the brake (the second noise), that is where the noise comes from.
any thoughts would be appreciated.
regards
doug
any thoughts would be appreciated.
regards
doug
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Pro
Joined: Sep 2002
Posts: 500
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From: Mississauga ONT
Re: brake problems.....help, please (Siveck)
Those clips actually hold the caliper in place. When i swapped out to a z07 kit i thought i didnt need them. every time i would hit the brake i would hear a clunk, and on release too. Even over bumps at low speeds i could hear the calipers banging around. Of course my old idiot mechanic had no clue and said it was normal.. :lol: :lol: i figured it out when i got home. Although my front calipers do click very slightly when i use them repeatedly at very low speeds....
Safety Car
Joined: Jan 2001
Posts: 4,385
Likes: 689
From: Boise ID
Re: brake problems.....help, please (92TripleBlack)
None of my pads have these clips :confused: I am Refering to a thread a few days ago which showed a clip on the ends of each pad. I sometimes have a clunking noise when lightly applying the brakes at low speeds from the right rear. Do I need to go to the dealer to get these clips?
[Modified by 87SAM, 8:26 AM 1/16/2003]
[Modified by 87SAM, 8:26 AM 1/16/2003]
Intermediate
Joined: May 2002
Posts: 32
Likes: 0
Re: brake problems.....help, please (dsky)
there is no pad rattling, the piston actuates when the pedal is depressed (clamps down - clunk) and then the piston pulls off the rotor when i take my foot off the brake (the second noise), that is where the noise comes from.
any thoughts would be appreciated.
regards
doug
any thoughts would be appreciated.
regards
doug
So you've got too much seal "roll-back".
This O-ring twists a small amount as the piston travels out when the brakes are applied, then it twists back - "rolls back" - and this action pulls the piston back into the caliper bore, since of course disc brake calipers have no return springs.
If there's too much seal roll-back, you get excessive piston travel, pad rattle, and excessive foot pedal travel.
You might take those calipers back, explain what's happening, get another set of calipers.
Regards,
R
[Modified by Redbob45, 4:31 PM 1/16/2003]
Melting Slicks
Joined: Apr 2002
Posts: 2,631
Likes: 2
From: Clever, MO aka SOMO
Re: brake problems.....help, please (Redbob45)
I thought the clips were only on the '88 and new 4 piston calipers. I don't remember seeing them on the '87 and older single piston units......not absolutely sure, but I know my '88 has them
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: brake problems.....help, please (fixvet)
The anti-rattle clips go on the pads and not the calipers. And 388 is right, they are so the calipers don't rattle, not the pads. dsky has the exact same simptoms that I had with my car a few years back...
Mike
Mike
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
Re: brake problems.....help, please (87SAM)
my "92 manual doesn't show them either, there was a "bias Spring" but no clips....heres a twist i noticed, the brakes don't clap when the car is in neutral?????????????? this weekend i'm completeley dis assembling then and doing a rebuild, i'm gonna ge to the bottom of this....let ya know how it goes
doug :jester
doug :jester
Drifting
Joined: Feb 2002
Posts: 1,937
Likes: 2
From: Arvada CO
Re: brake problems.....help, please (dsky)
DSKY....i know the problem and my vette sat for about 1 year because of this problem.....
ok let me ask questions....
so you did the break job and everything looks good and the you drop it down push the peddle to the floor and it goes all the way down then you let it up and do it again and again and then you start the car and they are just locked up and you are not able to even spin your tire if it is in the air...??? i bet i am right? let me know if i am and so i can tell you what you need to do..
example mine would work and i would drive it maybe like 10 feet and i would stop on the break and those bad boys would be on lock down...yeah eveyone told me to grease the pin and blah blah blah....but after i took my vette to a friend he fixed all the issues!
Thanks Kevin :yesnod:
ok let me ask questions....
so you did the break job and everything looks good and the you drop it down push the peddle to the floor and it goes all the way down then you let it up and do it again and again and then you start the car and they are just locked up and you are not able to even spin your tire if it is in the air...??? i bet i am right? let me know if i am and so i can tell you what you need to do..
example mine would work and i would drive it maybe like 10 feet and i would stop on the break and those bad boys would be on lock down...yeah eveyone told me to grease the pin and blah blah blah....but after i took my vette to a friend he fixed all the issues!
Thanks Kevin :yesnod:
Drifting
Joined: Feb 2002
Posts: 1,937
Likes: 2
From: Arvada CO
Re: brake problems.....help, please (krivera)
oh yeah i can tell you how to fix the machine gun sound aswell that is how mine all started....driving hit the brake and bomb bomb bomb bomb i thought i blew a tire! but then after all of that...my brakes would just lock! so keep in mind some day they are going to lock on you!
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
Re: brake problems.....help, please (dsky)
dsky,
If your pads do not have the clips on them then that is your problem. Take the pads out of the calipers and put the clips on. Your problem will disappear after that...
Mike
If your pads do not have the clips on them then that is your problem. Take the pads out of the calipers and put the clips on. Your problem will disappear after that...
Mike
