Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres
66 non power brake diagnosis
anychevy:
Before I start pulling things apart and ordering parts, I though I should get some advice first.
#1 Get in the car and the brake pedal goes straight to the floor, but will pump up and hold, but sometimes slowly drops to the floor again.
Inspected all brake lines, hoses and calipers for obvious leaks, but all dry.
Haven't noticed any loss of fluid in the resevior, but it's only been a day.
#2 Brakes pull hard to the right and again, nothing jumps out as obvious, calipers look o.k. no leaks and the hoses look good on the outside.
It feels like the right caliper grabs the rotor and a split second later the left grabs. Very scary !
I think there's air in the system and the piston cups in the MC are probably gone, but it's the pulling to the right that has me baffled.
The previous owner said "it's always been like that"
Any ideas if (like I suspect) bleeding does nothing ?
sirfixalot:
Probably the flexible hose on L/hand side is collapsed/blocked inside. Replace all four if one has gone. Use a bottle of fluid on front & another for rear to flush out all old fluid.
Maybee a siezed piston in l/hand caliper? Mixed set of disc pads, different composition.
A new master cylinder is only about $150 probably the old one has rust in the bore down past where it would normally operate when pedal goes to floor causes small scores in seals which allows fluid past seal
77CVT:
Grab a mate, clamp all 4 lines and press on the pedal while your mate releases one corner at a time. You should feel the pedal move slightly when the clamp is released (normal) and when you get to the dodgy corner the pedal will move a lot.
If the pedal moves a lot when all of them are clamped, it is the master cylinder.
If you have a dodgy caliper, get online and buy some new ones! I've never had any real success reconditioning old calipers. I had a similar problem with my 71 and bought new ones - no problem since! (and it cost less than getting them reco'd)
May as well get new rubber lines while you are at it. For $100 for 4 it sure beats $40 each to get made up here in Aus.
:beer:
anychevy:
--- Quote from: 77CVT link=topic=9105.msg1045942293#msg1045942293 ---
If you have a dodgy caliper, get online and buy some new ones!
May as well get new rubber lines while you are at it. For $100 for 4 it sure beats $40 each to get made up here in Aus.
--- End quote ---
Thanks sirfixalot & 77CVT
Do you guys know a good US source for brake components ?
I'll definately get pads, hoses and maybe front calipers (the back look pretty new)
The MC is just the single outlet type, so I'm guessing that won't be too hard to get fixed locally ?
LHF caliper looks newer than the RHF and the pads are different brands, so it looks like "Bubba" had a go at it.
I'll bleed it first, just in case there's air. Then start start testing things.
Thanks again
Cheers
bfit:
Mate can you post of photo of the master cyl.
single out let does not sound rite But I am not up on variations on your model
IN any case a single out let would not supply adequate volume to all four calipers.
Bfit
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