no brake pressure

BUELLRIDER · Post by **BUELLRIDER** » Fri Nov 27, 2015 12:33 pm

I have had bad brake press for a few years. I would have to pump the brakes for them to work. Now the pedal goes right to the floor and will not pump up.Could this be a bad Mas Cyl, Power booster or bad Calipers , How do I trouble shot this?

hornhospital · Post by **hornhospital** » Fri Nov 27, 2015 1:37 pm

Master cylinder. Have you noticed any fluid coming into the driver's footwell?

Do you have fluid in the reservoir?

86_6series · Post by **86_6series** » Fri Nov 27, 2015 1:43 pm

If filled with fluid---master

If not filled---a leak somewhere

If for a while---master

BUELLRIDER · Post by **BUELLRIDER** » Fri Nov 27, 2015 1:44 pm

No leaking that I can see yet

olympia57 · Post by **olympia57** » Fri Nov 27, 2015 1:46 pm

If you've had the problem for years and it was getting steadily worse I think I'd thoroughly bleed the system first and get rid of the old fluid in case it has become hygroscopic .
Check all you flexible hoses to see if they are inflating when brake pedal applied .
You also do have the symptoms of a passing seal in the master cylinder too.
A rebuild kit is cheap and easily done and providing the internal bore of the MC is serviceable then it will certainly put that back into commission.

Brucey · Post by **Brucey** » Fri Nov 27, 2015 2:07 pm

its the MC, almost for certain.

NB a failing booster cannot cause this behaviour.

cheers

BUELLRIDER · Post by **BUELLRIDER** » Sat Nov 28, 2015 1:00 pm

Well my parts car is an 86 6er ,so it has ABS brakes . Now should I take the time to switch my 81 6er to ABS or just slap a Standard MC on it and go?????

Brucey · Post by **Brucey** » Sat Nov 28, 2015 1:32 pm

BUELLRIDER wrote:Well my parts car is an 86 6er ,so it has ABS brakes . Now should I take the time to switch my 81 6er to ABS or just slap a Standard MC on it and go?????

you will find that the parts are nothing like the same for cars built pre-5/82 vs those after.

BTW apologies; if you have remote vacuum servos then IIRC it is possible for these to fail in such a way as the pedal goes to the floor. A hydraulic servo (as fitted to post 5/82 builds) cannot do this and it was that type I was referring to earlier.

cheers