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Car Forum / Volvo Cars / June 20051990 740 Braking problem - HELP!!
Hi there, I really need some help here. Driving along, minding my own business, went to brake and everything was very strange. Pedel felt a lot lower than normal. Came to a stop and on engine idle, the pedel was all the way to the floor. The RAC man that came to rescue me suggested that it's not the master cylinder but the servo that's died. Where can I get one in the UK? How much should I expect to pay and how difficult is it to fix? Any other suggestion are more than welcome. many thanks, Richard > Hi there, > [quoted text clipped - 11 lines] > > Any other suggestion are more than welcome. German French & Swedish, or EuroCar Parts. All available via internet. Tim.. > Hi there, > [quoted text clipped - 15 lines] > > Richard We are two people separated by a common language... is "servo" what we yanks call the "booster" - the vacuum operated assist located between the firewall and the master cylinder? Or is this an ABS system and the servo is part of the ABS control? It sure doesn't sound like a booster to me. Those failures make the brake harder, and the mechanism just doesn't have the ability to make the pedal sink to the floor. The new price of a booster is outrageous - over $500 US last time I checked. However, they are readly available at a breaker for about 1/6 that price. But unless we are talking about an ABS system, I'd bet with confidence it is the master cylinder. If it's ABS, you need somebody who knows about them. Mike >>Hi there, >> [quoted text clipped - 31 lines] > > Mike Hi Mike, No ABS on this car so that should make life a bit easier. I'm thinking that I might try the hose first as it looks a bit tired. I'll go from there after that. Thanks for the replies, Richard > > Hi there, > > [quoted text clipped - 20 lines] > and the master cylinder? Or is this an ABS system and the servo is part of > the ABS control? Yes servo=booster and I agree, it doesn't sound like the problem here. > > > Hi there, > > > [quoted text clipped - 24 lines] > > Yes servo=booster and I agree, it doesn't sound like the problem here. When the servo goes, the pedal is high and hard, and it seems you need both feet and all your might, just for a normal stop. Aside from a linkage failure or a pad falling out, the only thing that will allow the brake pedal to go to the floor is some kind of fluid leak. Usually this is an internal leak by the seals in the master cylinder, but can be an external leak anywhere in the system. Check for brake fluid around the calipers.  SignatureMike F. Thornhill (near Toronto), Ont. Replace tt with t (twice!) and remove parentheses to email me directly. (But I check the newsgroup more often than this email address.) Thanks for all the comments so far. I';ve got over the first hudle and aquired a new master cylinder and servo. Volvo wanted over £500 for the pair (inc vat). Local scrappy had the two for £25.00. The swap over will happen tomorrow so I'll keep you posted if you like. I'm going to take a risk and just swap out the master cylinder first. Keep those fingers crossed for me! Richard >>>>Hi there, >>>> [quoted text clipped - 36 lines] > external leak anywhere in the system. Check for brake fluid around the > calipers. > Hi there, > [quoted text clipped - 15 lines] > > Richard What??? When the pedal sinks to the floor it usually is a fluid leak. That may be due to worn seals in master or wheel cylinders or cracked pipes or hoses. Worn seals in cylinders are often due to rust on cylinder walls, due to not changing brake fluid often enouqh. (By cylinders I mean the Master cylinder and the Wheel cylinders in drum brakes or Calipers in disk brakes). Master cylinder leaks are not easily spotted. All cylinders can be honed and fitted with new seals, but it is not easy. Brake hoses crack by age or by hitting things, and brake pipes rust (corrode) from both inside and outside. They can be changed...... Asbjørn Just for the record, it was the master cylinder that died. All is now good. Thanks for all the help, Richard >>Hi there, >> [quoted text clipped - 31 lines] > > Asbjørn |
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