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#499488 - 09/09/04 06:04 AM CJ7 BRAKE PROBLEM
Anonymous
Unregistered

I HAVE A 77 CJ7 4 WHEEL DRUM BRAKES. I PUT NEW SHOES FRONT AND REAR, THEY ARE ADJUSTED CORRECTLY. IT HAD NON POWER BRAKES. I ADDED A POWER BRAKE BOOSTER, NEW, AND A NEW MASTER CYLENDER. I ALSO BLEED THE BRAKES SEVERAL TIMES.
I CAN NOT GET A FIRM PEDAL. ITGOES ABOUT A 1 INCH FROM THE FLOOR BEFORE THE BRAKES ENGAGE AND THEY WILL NOT LOCK UP.
IT FEELS LIKE THE BRAKES ARE WAY OUT OF ADJUSTMENT, BUT I KNOW THEY ARE NOT. PUMPING THE BRAKES DOES NOT MAKE A DIFFERENCE AND IT DOES NOT LOOSE PREASURE WHEN YOU HOLD THE PEDAL DOWN. CAN ANY BODY HELP ME ?
CJ7 BRAKES
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#499489 - 09/09/04 06:28 AM Re: CJ7 BRAKE PROBLEM
BigJim Offline
Web Wheeler
Registered: 10/07/03
Posts: 7768
Loc: Central Texas
I'd pick up the wheels one at a time and READJUST them then I would spemd the 4 bucks or so and buy a simple brake vacuum pump and I'd vacuum them till there was frost in hell. With everything you have written you should have a good pedal. It goes to the floor because it is spreading the shoes too much or you have air in the system and the air is compressing allowing to much pedal movement.
Big Jim
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#499490 - 09/09/04 07:11 AM Re: CJ7 BRAKE PROBLEM [Re: BigJim]
Anonymous
Unregistered

make sure you adjsut the brakes with the drums on. if you have a lip on the drum you may be under adjsuting. when proporly adjusted there should be a light drag as you turn the hub.
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#499491 - 09/09/04 06:22 PM Re: CJ7 BRAKE PROBLEM
valleycat Offline
Body Damage is Cool
Registered: 12/07/03
Posts: 1056
Loc: Phoenix, AZ
this has nothing to do with your question but read this.

http://www.chtopping.com/CustomRod4/
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#499492 - 09/10/04 08:19 AM Re: CJ7 BRAKE PROBLEM
Anonymous
Unregistered

after you check the stuff these guys are telling you
make sure you do not have a master cyl. for disc brakes
the one for drum brakes has check valves. if you have
cyl. for front disc you will never get it adjusted.
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#499493 - 09/10/04 09:06 AM Re: CJ7 BRAKE PROBLEM
carnuck Offline
Getting the Wheeling Fever
Registered: 12/26/03
Posts: 72
Loc: Seattle, WA
One more thing. You need to readjust the brakes after a short drive and be sure the the Ebrake cables aren't too tight. They will hold the shoes part way off the cylinder and when you hit the brake, the stretch of the cables will act like springs and make them feel mushy. (been there, done that!) Any wear in the backing plates will cock the shoes so they don't seat right too while adjusting.


Oh! A faulty master or one with too small of a bore will affect your brakes too!
_________________________
Build your truck the head men say, but it must be built in such a way...
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#499494 - 09/10/04 03:46 PM Re: CJ7 BRAKE PROBLEM
atavuss Offline
Mudrunner
Registered: 02/24/04
Posts: 291
I also have a 77 CJ7, but mine has factory disk brakes on the front, anyone know if that was an option or was it standard on later production 77?
did you bench bleed the master cylinder before you installed it in the vehicle? where did you get the booster and master cylinder at? sure it is the proper application? have you adjusted the rod in the booster (not all boosters have an adjustable rod)?
FWIW, my Jeep never has had a really high and firm pedal........but it does stop good (factory disk on front and factory 11" drums on rear)! I believe there was a recall or TSB when this model was fairly new, something about the booster rod needed adjusting. also, I have been running dot 5 silicone brake fluid for many years.


Edited by atavuss (09/10/04 03:57 PM)
_________________________
04 4x4 Double Cab Tacoma v6 TRD, all stock

77 Jeep CJ7, 304 v8, 33x12.50x15 bfg, 4.10 gears, 44 rear end, ford bronco low range gear mod, warn 6k winch, rubicon tested

1969 M274a5 Military Mechanical Mule

46 Bantam Civilian trailer
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#499495 - 09/10/04 06:18 PM Re: CJ7 BRAKE PROBLEM [Re: atavuss]
Anonymous
Unregistered

I have factory discs on my 77. I thought that is the year they switched but, i re did the brakes the guy said it depended on the time of year... ie first 6 months or last 6 months... just a rumour.
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#499496 - 09/11/04 05:32 AM Re: CJ7 BRAKE PROBLEM
Anonymous
Unregistered

You have to make sure you have pumped the master cylinder full of brake fluid before you install it or you will pump lots and lots of air into the lines.
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