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Brakes

Hi Folks
Just a quick question about brakes... If you know the hyraulics (spel)are o.k. no loss of brake fluid, there's no hole in the hose that goes from the manifold to the booster, how do I check that the booster is either working or is screwed?
Symptoms; when braking, it's exactly like the brake pedal is connected to the rear drums!I have to exert a lot of pressure to get the brakes to engage.So I checked for leaks in the brake fluid and it's all o.k. Just thought it might be the booster.
Any thoughts

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Hi guy

Firstly, if your car is an auto, stick in drive (running of course) and put your brake on, if the car creeps forward and your brake pedal creeps down your master cyl is stuffed, easy peasy.
But if it a manual you cant really check it. but I would say your master is stuffed BECAUSE you say you arnt losing ANY fluid at all.
What could be happening is that the bore in the master has worn down and sections of it are thinner than other sections, stick with me here. And what is happening when you have the brake on the pressue is forcing the fluid through the thinner sections resulting in your pedal losing pressure. I relise this hasnt really anserwd your orig question but any problems that stem from this relate to the master cyl, so I would invest the odd $100 and buy a newbie because how much is your ride really worth?

I'm sure kikurass could answer your question better than I'm trying here, but that would start another uproar inn the room, just joking guys.

yogie

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Pretty well on the money I reckon Yogie...When the bore in your master cylinder wears and you put pressure on the brake pedal, fluid seeps past the seals from the front brake reservoir (back of the master cylinder) to the back brake reservoir (at the front of the cylinder)...hey presto...no (or weak) front brakes. OR...someone has had the brake lines disconnected from the master cylinder and have hooked them up backwards...unlikely, but has been known to happen.

Best way to fix it is get a stainless steel sleeve put in the master cylinder...it will basically last forever then.

The only other possible, but very unlikely, scenario is that both front calipers have seized...were there any other signs of brake problems? Did your car pull to one side when you braked for a while?

To check the booster...with motor off, pump brake pedal several times to use all vacuum. While holding light pressure on brake pedal, start car and the pedal should fall away under your foot.

HTH...Dave

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Cheers...Dave

"Search more, Post less"

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Qute's Shed

My VN makes a hissing sound when a push the pedal. Not shure if I have a leaking booster. It still provides assistance.

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"were there any other signs of
brake problems? Did your car pull to one side when you braked for a while? "
Nope, no pulling to one side, it just started to fade gradually until it got to the stage where I was heading down hills with both feet on the brake pedal. I changed the pads on the front calipers recently and they seemed to be okay, I don't think they would have moved back for the new linings if they were seized, and as I say, there isn't any brake fluid loss. It hasn't been changed for a while tho... I read somewhere that brake fluid can kind of "go off" Might change it and bleed the brakes and see what happens first... Oh bugger it, I might as well stop being a chicken about it and just replace the master, the booster, and do the brake fluid change all in one go. (God I hate Brake stuff!)∞

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Thanks for the advice. Whether or not it's the Master Cyl or the booster, I might as well get a new Master if they're only round the $100.00 mark anyways, might save a bit of hassle later on (I hate Brake stuff!) Cheers Yogie
M.M.o

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when u take the vac line off the booster it should suck a bit ? thats when u just stopped the motor? if it dont then the booster is stuffed

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Cheers mate, thanks for that. I'll do that first before I replace it. But I reckon I'll just do the works anyways. She's going for a blue ticket so it has to be pretty much perfect.
MM

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If the pedal is hard,and you have no fluid loss chances are the diaphram in the booster is shot.

When the pedal slowly sinks to the floor this means the master cyl seals are worn out.

You can check to see if your master is buggered by using a piece if string with a small bolt attached.
remove the check valve (vacuum hose) and lower the string to the bottom,if it comes out wet then you have fluid leaking past the piston in the master.

But this will not cause the brakes to be any less efficient,just the pedal will slowly drop to the floor and you will have to re-apply the brakes to regain pedal tension.

My money is on the booster,simply because you stated that it takes extra pressure to apply the brakes.kik

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Thanks for that Kik,
I reckon you're right. Still gonna seriously think about overhauling the whole lot now, coz the more I think about it, the more I reckon it'll save me a lot of time and effort (especially in keeping the guy who issues the blue slip happy).
cheers
MMw

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can some 1 tell me the procedure of replacing brake booster and roughly cost of a new one. i have a 95 vs calais with abs
thanx

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