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flexll
Novice
Apr 9, 2010, 6:12 AM
Post #1 of 4
(2169 views)
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1985 chev corvette,54k miles,4 speed,5.7L. Both front brakes applied hard while driving,pedal was high and hard,rears were ok.was able to move car in 1st gear only.after an hour they released and I could move car again. Also,while I am here the vette has always had an idle surge/blip 500-800. replaced intake manifold gaskets,vac hoses,egr,idle air control,plugs wires cap.Your thoughts and thanks in advance!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 9, 2010, 6:38 AM
Post #2 of 4
(2167 views)
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You'd do better to separate the problems with two threads. I start with the brakes:
What is the use and storage situation with this car?
Pedal high and hard with BOTH front brakes staying engaged suggests one common reason. If it has one common flex hose for fronts I'd suspect that but as a test you could hoist front wheels and they would be stuck or sticky, have a helper apply brakes and quickly bleed off a tad of fluid at the master cylinder line to front brakes (usually the line closest to booster) and shut back before pressure is off brake. Catch drips with disposable paper towels or rags! Let go of brake (helper) and if front wheels are free then I'd blame a common flex hose OR the master cylinder is so tight with pushrod clearance or a fault that it won't allow return of pressure to reservoir.
If this car has extended storage outdoors especially over ground not pavement then calipers may have frozen up from just sitting.
How car is stored and overall condition despite the low miles is going to be everything in what can and will be found wrong,
T
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re-tired
Veteran
/ Moderator
Apr 9, 2010, 11:58 AM
Post #3 of 4
(2163 views)
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Tom,i do it a slightly diffrent way.With front wheels off ground ,have helper press and release pedal. Try turn each tire. If tight crack open bleeder on one wheel , if it frees up caliper is ok and problem is upstream(hose maybe). If wheel does not free up, caliper is hung.Repeat on other side.This works 98.23455556 % of time . If not keep working upstream.
LIFE'S SHORT GO FISH
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 9, 2010, 12:19 PM
Post #4 of 4
(2160 views)
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Re:85 Vette, front brakes sticking
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RT - I like and do that way also and it should be tried. What worries me is it's BOTH wheels and if the common hose failure I guess one would stay locked with at the caliper test. I just smell it (it's a Vette) that they used another flex hose but not sure. Most other cars don't.
So for now I'll take back my first suggestion and say start at the wheels and if no results move back up the system to where it releases the calipers or as you said blame the calipers which could be both if stored long enough with some moisture especially and more-so if it uses DOT 5 brake fluid (? Vette) which TMK isn't hygroscopic (water absorbing) and could make a rusted mess at pistons in calipers more easily,
T
(This post was edited by Tom Greenleaf on Apr 9, 2010, 12:23 PM)
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