Author Topic: 69 RF brake lock up?  (Read 19394 times)

myblue67

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Re: 69 RF brake lock up?
« Reply #120 on: July 22, 2018, 11:59:06 AM »
Did you ever resolve the problem? Had/Have same issue on 67. Ended up replacing most components, seemed to start working better for a couple drives then came back. Seems to happen if the car sits for a week or two without driving, but no specific remedy determined. Haven't had my car out at all this summer because unable to resolve again. Now issue on both front wheels. I just barley touch the pedal it locks up hard. I've had short rods, log rods, new stainless lines, calipers, master cylinder, booster, distribution block etc.. Feel like I should put wing nuts on my wheels I've had them on/off so many times. No luck and pissed.

Rufcar

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Re: 69 RF brake lock up?
« Reply #121 on: July 30, 2018, 09:35:39 PM »
yes read my previous replies. I used a pressure reducing valve on the one line to the one locking wheel.

BobH11

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Re: 69 RF brake lock up?
« Reply #122 on: July 31, 2018, 12:12:06 AM »
Myblue67, I had a similar problem with my 69. With mine the rear brakes would lockup instantly. After replacing all the rear brake parts, turns out the front brakes weren’t working at all. Seams both front rubber lines swelled and the metal bracket that supports the line wouldn’t let any fluid thru. Maybe check your rear brakes to make sure they are working properly.

Rufcar

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Re: 69 RF brake lock up?
« Reply #123 on: July 31, 2018, 09:10:21 PM »
Here is a picture of the valve I used , in line, to solve my right wheel lock up problem. Its on ebay Speedway Compact Adjustable Made in the USA! $35.00.

Opium Motors

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Re: 69 RF brake lock up?
« Reply #124 on: August 09, 2018, 06:29:57 AM »
I will throw in my two cents:

This may not be your problem but I believe it may help someone out there.

I had taken on a truck that had a locking of the brake issue. First the basics:

Cars with Front disc-drum rear it will have a Master Cylinder that has a large front small rear reservoir. Cars with drum-drum or disc-disc brakes will have equal sized reservoirs.

So back to this truck, it had disc-drum set-up, from the factory, so large-small MC. He replaced the rear drums with discs, for that cool 4 wheel disc feeling, without changing the MC to equal reservoirs. Drive, hit the breaks and a rear wheel would lock up and stay that way unless you bleed the line.

Simple fix was to replace the Master Cylinder. Done Deal.

Hope this may help someone now or in the future.

-joey
1968 Camaro RS Convertible 327 4 Speed Corvette Bronze
1973 Corvette 454

67 RS Ragtop

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Re: 69 RF brake lock up?
« Reply #125 on: August 09, 2018, 04:03:48 PM »
Most likely due to the RPV's used at the rears, on drum disc applications. FWIW

Rufcar

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Re: 69 RF brake lock up?
« Reply #126 on: August 14, 2018, 01:56:46 PM »
Mac was changed 3 times.  If you read previous posts you will see where I changed everything. But I appreciate the new  advice.  I will check that but as I stated it's much more due to irregular parts.

67 RS Ragtop

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Re: 69 RF brake lock up?
« Reply #127 on: August 16, 2018, 04:26:05 PM »
Sorry, My reply was to Opium Motors prior post, I was aware you had changed the M/C several times. Again, sorry I got off track there.