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Brake Problem

Brake Problem

polish85

Active Jeeper
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271
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Location
Charlotte, NC
Vehicle(s)
1977 CJ5 I-6
i replaced all my brake shoes, springs, and levers and drums...when i go to bleed them i have zero pressure in my peddle after i bleed them all? Also when i start driving there is a metal to metal grinding on the right front tire?!?!?! i took it apart and everything looks fine...any idea what else it could be...the lever is all the way down so thats out of the question.....help i need to drive to work tomorrow morning!!!!
 
does the grinding happen when it is up on a jack stand and you turn the wheel??
describe the procedure you used to bleed the brakes.:cool:

i replaced all my brake shoes, springs, and levers and drums...when i go to bleed them i have zero pressure in my peddle after i bleed them all? Also when i start driving there is a metal to metal grinding on the right front tire?!?!?! i took it apart and everything looks fine...any idea what else it could be...the lever is all the way down so thats out of the question.....help i need to drive to work tomorrow morning!!!!
 
no the grinding doesnt happen when it is on the jack stand when the wheels are straight, didnt try turning them to the side...i start at passenger rear tire, pump the brake a few times and hold the brake then while holding release the bleeder screw until the brake fluid shoots out and tighten it before it all runs out. and repeat the process for each tire doing the driver front side last.
 
the grinding sounds like a bad bearing in the front
 
The best way I have found to bleed the brakes is to put a length of 1/8 inch vacuum line on the end of the bleed port and and drop the other end in a glass jar with enough fluid in it to keep the hose end submerged. Open the valve and pump the brake until the bubbles stop. close the valve, remove the hose and go to the next closest. Keep an eye on the reservoir level and keep the end of the hose submerged as long as the valve is open. Your way works well enough but this way you don't blow fluid all over the floor and in fact you can just dump it back in the reservoir.
did you replace the master as well??:cool:
 
The best way I have found to bleed the brakes is to put a length of 1/8 inch vacuum line on the end of the bleed port and and drop the other end in a glass jar with enough fluid in it to keep the hose end submerged. Open the valve and pump the brake until the bubbles stop. close the valve, remove the hose and go to the next closest. Keep an eye on the reservoir level and keep the end of the hose submerged as long as the valve is open. Your way works well enough but this way you don't blow fluid all over the floor and in fact you can just dump it back in the reservoir.
did you replace the master as well??:cool:

I will try your method tomorrow if i get a second. Yes i replaced the MC. slowing replacing everything.
 
Did you prime the master cylinder??
:cool:

One other thing to remember, Brake fluid is the best paint remover in the world. It will go to bare metal before you can wipe it off.

I will try your method tomorrow if i get a second. Yes i replaced the MC. slowing replacing everything.
 
the grinding sounds like a bad bearing in the front

Did you prime the master cylinder??
:cool:

One other thing to remember, Brake fluid is the best paint remover in the world. It will go to bare metal before you can wipe it off.

Sure does sound like a bad bearing doesn't it ? Weight of the vehicle loading the bearing.

Got to prime the master before you can bleed the lines.
 
pump the brake a few times and hold the brake then while holding release the bleeder screw until the brake fluid shoots out and tighten it before it all runs out. and repeat the process for each tire doing the driver front side last.
Not sure if I understand. Do you bleed the brakes with 2 people? If you have someone hold the brake pedal down as you tighten up the bleeder valve that should work. If you press on the brake untill fluid shoots out. Then get out. The brake will suck air when you release the pedal. Never release the pedal until you can tighten the bleeder valve. Otherwise you will get air in the brake lines.
Maybe you are doing it right. I'm just not clear.
 
did you depress the button on the proportioning valve??:cool:
 
I remember when I bled my rear brakes...I thought they would never bleed. I swear it took forever, I was beginning to think I had a leak in the system pulling in air somewhere. Eventually, I was successfull. :rolleyes:
 
I remember when I bled my rear brakes...I thought they would never bleed. I swear it took forever, I was beginning to think I had a leak in the system pulling in air somewhere. Eventually, I was successfull. :rolleyes:
Thats what im thinking for the front brake! because after my buddy pumped the brakes and i loosened the bleeder nothing really came out just kinda dripped...so i did it like 5 times and finally it shot out and it tightened it. But i still dont have any pressure really...i drove it to work today bc i had no choice but i have to pump the brakes about 5 times before it stops hitting the floor. BTW is it ok to drive on the busted bearing???
 
I remember when I bled my rear brakes...I thought they would never bleed. I swear it took forever, I was beginning to think I had a leak in the system pulling in air somewhere. Eventually, I was successfull. :rolleyes:
Thats what im thinking for the front brake! because after my buddy pumped the brakes and i loosened the bleeder nothing really came out just kinda dripped...so i did it like 5 times and finally it shot out and i tightened it. But i still dont have any pressure really...i drove it to work today bc i had no choice but i have to pump the brakes about 5 times before it stops hitting the floor. BTW is it ok to drive on the busted bearing???
 
BTW is it ok to drive on the busted bearing???

No it's not. Get the bearings changed now before you junk the whole spindle.
 
I just spoke to a 4 wheel shop and they said that if its the stock Dana 30 it doesnt have wheel bearings...is that correct? they said that noise might be ring and pinion? does that even sound correct??? quoted me at 700 dollars!
 
Don't just walk away from that shop! Run! :eek:

All axles have some sort of bearing supporting the hub or the wheel. The Dana 30 has an inner and outer wheel bearing as well as a needle bearing that supports the axle shaft.

Did the grinding start after the brake replacements or has it been there for a while?

Your going to need to dig into the axle, take it apart and do some diagnoses. I suspect that a shoe is not installed correctly, the star wheel has fallen down or something along those lines.

Do you have locking hubs? I would look very closely at those breaks before I took a hub apart.

Interesting that you have a 77 with drum breaks on the front, disks were the preferred choice after 75.

Dana 30 break down #1 -->> Dana Model 30 Front Axle for Jeep CJ5, CJ7, & CJ8 Scrambler at Morris 4x4 Center

Brakes -->> Jeep CJ5, CJ7 & CJ8 Scrambler Brake Parts

Online service manual -->> Jeep Informational Center at Morris 4x4 Center
 
Don't just walk away from that shop! Run! :eek:

All axles have some sort of bearing supporting the hub or the wheel. The Dana 30 has an inner and outer wheel bearing as well as a needle bearing that supports the axle shaft.

Did the grinding start after the brake replacements or has it been there for a while?

Your going to need to dig into the axle, take it apart and do some diagnoses. I suspect that a shoe is not installed correctly, the star wheel has fallen down or something along those lines.

Do you have locking hubs? I would look very closely at those breaks before I took a hub apart.

Interesting that you have a 77 with drum breaks on the front, disks were the preferred choice after 75.

Dana 30 break down #1 -->> Dana Model 30 Front Axle for Jeep CJ5, CJ7, & CJ8 Scrambler at Morris 4x4 Center

Brakes -->> Jeep CJ5, CJ7 & CJ8 Scrambler Brake Parts

Online service manual -->> Jeep Informational Center at Morris 4x4 Center

I was driving down the road one day and i went to press the brakes and they just dropped to the floor and i heard a big boom from the front right (the one that im having problems with right now)...so i thought maybe the brakes were just gone. so i went ahead and replaced everything in the assemby (springs, lever, cylinder, brake hose, shoes, and drums)...im 99 % sure i put everything back together because all the other wheels are ok. When i have the wheel in the air it makes zero noise when turning it...as soon as i drop it and start driving i have the metal to metal scraping noise. I have the manual locking hub in the front that is correct.
 

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