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1970 Jeep Commander Brakes do not work

Tiny
FIREDRETIRED
  • MEMBER
  • 1970 JEEP COMMANDER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 78,000 MILES
I had the booster, master cylinder, and all wheel cylindrers replaced. The brake is still hard on applying and does not stop the vehicle, had the booster rebuilt and checked or leakage twice, its ok. The brake booster place tell me the wrong master cylinder is on the jeep, I have no way of checking which one is the right one, because after the replacement, the old one got thrown away. What master cylinder goes on the Jeepster commando 1970? Hope u can help thanks
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Wednesday, October 27th, 2010 AT 10:08 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I had the booster, master cylinder, and all wheel cylindrers replaced. Why is it that it needs to be rebuild?

Hard brake pedal could be caused by the brake booster check valve, leaking vacuum hose and overall low engine vacuum
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Thursday, October 28th, 2010 AT 12:35 AM
Tiny
FIREDRETIRED
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  • 3 POSTS
My original question was what master cylinder goes on the jeep? The check valve you mentioned was checked twice and holds pressue. I found out there is suppose to be a distance of 1/32 between the brake booster and the plunger for the master cylinder, Thanks again
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Thursday, October 28th, 2010 AT 10:27 AM
Tiny
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  • MECHANIC
  • 75,992 POSTS
I've looked into Mit1 and Alldata professional references and no available information or my library concerning your year and model for the brake master cylinder as far as part number-nothing

Have you tried adjusting the brake booster pushrod? If so and clearance is still off, I'm sorry this is as far as I can take you-Request for refund as you wish
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Thursday, October 28th, 2010 AT 10:58 AM
Tiny
FIREDRETIRED
  • MEMBER
  • 3 POSTS
I dont mind donating but I dont feel u have answered my questions I asked for, so u probably need to refune my donation, I still have the same exisiting problem. Thanks
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Thursday, October 28th, 2010 AT 11:43 AM
Tiny
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  • MECHANIC
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If you don't adjust the pushrod properly it will cause the clearance problem-
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Thursday, October 28th, 2010 AT 3:22 PM
Tiny
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  • MEMBER
  • 3 POSTS
As I stated before, we did adjust it to 1/32 for the clearance. The brake is hard and will not stop the vehicle. But thanks anyway, refund my donation
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Thursday, October 28th, 2010 AT 3:29 PM
Tiny
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  • MECHANIC
  • 75,992 POSTS
As I stated before, we did adjust it to 1/32 for the clearance.

You didn't mentioned this in your original question, you came back after I've answered the 1st that it was noticed- Refund will be processed immediately.
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Thursday, October 28th, 2010 AT 3:43 PM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
We have refunded your donation. I hope we can help you next time.
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Thursday, October 28th, 2010 AT 4:00 PM

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