1990 740 Braking problem - HELP!!

German French & Swedish, or EuroCar Parts. All available via internet.

Tim..

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 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

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

Asbjørn wrote: