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Post Info TOPIC: Bonneville brake problems


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Bonneville brake problems


My 69 Bonneville is having some brake issues,  Pedal goes all the way to the floor, and just barely able to stop it,, ( Disc front Drum Rear)I pulled the front wheels, and the pads are like new, same with the rear,  so now I'm thinking it could be either the booster OR the master cylinder, both are origional equipment even tho the car only has 53K origional miles on it,  I put pressure on the brake pedal without the motor running and the pedal was real firm no fade at all,, but with still, holding that pressure, on the pedal, I started the motor and the pedal went all the way to the floor as soon as it started,

NOW!!!!  does that mean the master is bad? or is the booster bad? or perhaps BOTH??    

I'm thinking maybe just change both the master and booster,  but if somebody has a better idea, Please HOLLAR!!! Thanks 



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My guess is the booster - - - - - believe it or not I had "TWO" go out in less than 5 years on my '55 and that's exactly the way my pedal did. Good Luck, Amigo and let us know what you find out OK?

meller

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Probably the booster diaphragm has 'bit the dust'. A master cylinder internal cup leak will let the pedal go to the floor running or not.

A couple things to check first - the vacuum hose from the intake to the booster. Has it 'blown off' from a backfire, split from old age? There should be a check valve in that vacuum line to prevent backfire damage, but they hang open occasionally.  Another - is there oil in the vacuum line? Oil will 'kill' rubber lines as well as the diaphragm.

Probably wouldn't hurt to replace both if original 45 year old stuff and flush the old brake fluid out through all four corners if it's more then 3-4 years old

Rock Auto has a reman assembly with MC for about $86    http://www.rockauto.com/ The check valve is $14 and change from there too

 



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Thanks for the reply's ,Guys   ,, I checked the vacuum hose, it is nearly new, in good shape, checked the booster check valve its good, all those parts have been replaced, the booster and master cylinder are the only origional parts left,, I think I'll bite the bullet and replace both the booster and M Cylinder , just to be on the safe side,  my luck I would replace one then the other one would take a dump, probably be easier to replace them together than do it all over later, 

I have a Baer brake 4 wheel  Disc brake system, that I bought for another project , but sold the car  before I got that far,, might have to make some brackets to make it work,, or modify the ones in the kit to  work but that's the fun part of playing with these old Junker's  Isn't it? front discs are for MM2 and rear discs are for 9"ford,, kinda odd ,, but the front wheel bearings for the Mustang are the almost the same size as the Pontiac,, just had to mill out the front disc rotors of the MM2 about 5 Thousands to make the bearings work....

 



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