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09-16-09, 10:46 PM
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#1 (permalink)
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Forum Regular
Join Date: Dec 2005
Location: MOAB
Posts: 110
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Brake Feel. MC? Booster?
My 69/77 hybrid pig has a real soft pedal, almost like you cannot feel anything so you push harder and harder and then all of the sudden BOOM they engage. I have tried to bleed the brakes, numerous time to see if that was the issue and it is not. I have also tried to monkey with the pedal to booster rod,(adjusting nuts) nothing. So I am wondering if it isn't my MC or Booster. When I push on the brakes as I am starting it up I feel the pedal move in slightly. Good? Bad?
If I do need to change the booster what problems will I run into; it being a 69 I believe that I have a 3 bolt pattern instead of a 4 bolt. The 3 bolt boosters look smaller/thinner then the 4 bolt. Any difference?
thanks for the help.
__________________
The Dude Abides
1969/77 FJ55
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09-17-09, 11:15 AM
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#2 (permalink)
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The Anti-Leafer
Join Date: Nov 2002
Location: Dallas, Georgia
Posts: 2,268
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The slight pedal movement would be the engine vacuum activating the booster. I have experienced that pedal movement upon startup before. Do you hear any air leakage from the booster at all? It could also be a vacuum leak somewhere else, but I'm guessing now.
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09-17-09, 03:59 PM
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#3 (permalink)
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Forum Lifer
Join Date: Jan 2003
Location: Cranbrook, B.C., Canada
Posts: 8,952
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Disc brakes? Have you adjusted the brakes recently? OEM '55 brakes are not self adjusting like a newer vehicle.
__________________
'82 BJ60 H55 tranny, AXT turbo 3B diesel, high nickel alloy head, A/C, BDS lift, factory PTO, Aussie rear locker, OEM LSD front, 4:11's, 32's, PERFECT frame!
'76 FJ55, 3B turbo, alloy head, H41 tranny, 3 sp. transfer, 33's, A/C, PTO winch, long range tank!
'67 FJ45LV shop project c/w 3B turbo diesel transplant & H41 4 speed, 3 speed transfer, PTO!
www.wirrell.com
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09-17-09, 04:52 PM
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#4 (permalink)
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Forum Regular
Join Date: Dec 2005
Location: MOAB
Posts: 110
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Quote:
Originally Posted by cruiser_guy
Disc brakes? Have you adjusted the brakes recently? OEM '55 brakes are not self adjusting like a newer vehicle.
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69 body with a 77 drivetrain. Front disc and rear drum.
I have gone through the whole system many times. I have searched and everything seems to be pointing to a bad MC. Since I do not know the story of the whole rig or how old any of the parts are I will try there first.....
wish me luck
__________________
The Dude Abides
1969/77 FJ55
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09-17-09, 07:43 PM
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#5 (permalink)
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Forum Lifer
Join Date: Jan 2003
Location: Cranbrook, B.C., Canada
Posts: 8,952
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OK, 'cause mis-adjusted brakes make the pedal go to the floor and sometimes it'll need two pumps to stop. All due to the pistons in the wheel cylinder needing to extend too far.
__________________
'82 BJ60 H55 tranny, AXT turbo 3B diesel, high nickel alloy head, A/C, BDS lift, factory PTO, Aussie rear locker, OEM LSD front, 4:11's, 32's, PERFECT frame!
'76 FJ55, 3B turbo, alloy head, H41 tranny, 3 sp. transfer, 33's, A/C, PTO winch, long range tank!
'67 FJ45LV shop project c/w 3B turbo diesel transplant & H41 4 speed, 3 speed transfer, PTO!
www.wirrell.com
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09-27-09, 10:48 PM
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#6 (permalink)
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250+ Club
Join Date: Jul 2003
Location: Folsom, CA
Posts: 729
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Do you have the 66 brake master in it, or the 77?
__________________
Bill Jackson, AKA "Cardinal Fang"
1973 FJ40 - 1975 FJ55 - TLCA#6607
Folsom, CA
"The iron hand
is no match
for the Iron Rod" ??
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09-28-09, 02:21 PM
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#7 (permalink)
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Forum Regular
Join Date: Dec 2005
Location: MOAB
Posts: 110
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I have the 69 booster in it. That is what was in it when I purchased it.
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The Dude Abides
1969/77 FJ55
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