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Old 10-04-2006, 07:11 PM
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Pedals goin to the floor

Today i replaced the pasenger side spindle on my 87 caprice. I replaced it because the threads for one of the caliper bolts got stripped. Anyways, I got it all put together and went for a test drive. I pumped the brakes a few times and they went staight to the floor. So I figured I might have broken a brake line that goes to the caliper when I had it moved out of the way. But I looked on the ground and saw no fluid. Checked the resevoir level and its still full. Had someone pump the brakes for me and didnt see any leaks.
How do I tell if my master cylinder or brake booster has gone bad?

Thanks for the help
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Old 10-05-2006, 04:01 AM
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Quote:
Originally Posted by cutsupreme

Today i replaced the pasenger side spindle on my 87 caprice. I replaced it because the threads for one of the caliper bolts got stripped. Anyways, I got it all put together and went for a test drive. I pumped the brakes a few times and they went staight to the floor.


Just a word of caution...never move a car after any type of brake work until you ascertain full pedal...

Quote:
So I figured I might have broken a brake line that goes to the caliper when I had it moved out of the way. But I looked on the ground and saw no fluid. Checked the resevoir level and its still full. Had someone pump the brakes for me and didnt see any leaks.

How do I tell if my master cylinder or brake booster has gone bad?

Thanks for the help
Did you have to compress the caliper piston to slide it back over the rotor? Did you pump the brakes to move the piston back out or have you lost hydraulics altogether?
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Old 10-05-2006, 04:54 AM
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Do you need to bleed the brake system? You didn't indicate that it was open when you were working on it, but.....just a thought.
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Old 10-05-2006, 05:06 AM
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This is probably a dumb reply but did you refill the master cylinder after you did your spindle swap/brake reinstallation?
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Old 10-05-2006, 05:37 AM
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Give us some more info.....after you pumped the pedal a few times...then how did it do? You may have just had to pump to move the piston in the caliper back into proper position.
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Old 10-05-2006, 06:34 AM
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I never opened the line at all. Although I did push in the piston mabe 1/8 of an inch at most. I repeatedly pumped the brakes many times with the pedal not getting any harder.
Thanks
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Old 10-05-2006, 06:36 AM
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Also the car will stop, it just takes a lot more pressure on the pedal. The brake light has not come on.
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Old 10-05-2006, 06:47 AM
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Quote:
Originally Posted by cutsupreme

Also the car will stop, it just takes a lot more pressure on the pedal. The brake light has not come on.
Confusing...

Maybe the piston got cocked trying to retract it? What method/type of tool did you use? A frozen piston would explain the hard pedal but not excessive pedal travel. There is absolutely no fluid escaping the caliper piston seal (you may have to pull the dust boot away from the piston to observe)? The seal may have been damaged (or just worn out).
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Old 10-05-2006, 06:53 AM
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I used a large pair of vise grips to push in the piston. I dont see any fluid escaping at all
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Old 10-05-2006, 03:06 PM
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I'd bet it's the brake hose, when you moved it, it may have gotten damaged ( from age, and twisted in diffrent ways than it had been b4 ), what happens with them is the sidewalls get weak so they expand outward, so it takes more of a pedal to stop.
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Old 10-06-2006, 10:21 AM
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OK I figured it out
I took the caliper off to check for any fliud leaks. When removing one of the caliper bolts I noticed that one of the sleeves on the caliper that the bolt slides into was all broken and half of it was gone. So when I had reinstalled the caliper the previous time, the caliper bolt must have came through too far and caused the caliper to sit incorrectly. so all I did was put in a new sleeve and the brakes works fine now.
Thanks for all the help and input
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