69 RF brake lock up?

[myblue67]

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]

yes read my previous replies. I used a pressure reducing valve on the one line to the one locking wheel.

[BobH11]

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]

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]

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

[67 RS Ragtop]

Most likely due to the RPV's used at the rears, on drum disc applications. FWIW

[Rufcar]

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]

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.

[Rufcar]

It has now been 8 months and I have driven the 69 over the summer, fall and good winter days and  and spring! My single line pressure reducing valve is still working perfectly. Plus I see this thread has close to 23k views! I hope folks with similar problems learned something?

[Rufcar]

another year has gone by, my metering valve has been working all is well. Plus we have over 31,000 views on this subject, I hope it has helped others.

[Rufcar]

My annual report, the added brake pressure valve is still working perfect.  It took a ton of labor and new parts to come up with the non stock idea but bottom line it works. 41k views hope its helped others .

[CantRepeat]

Did 69s ever come with manual disc brakes?

I ask because I knew a guy when I was a kid that tried to convert his manual disc brakes to power disc brakes by just adding a brake booster and vacuum line. It never worked right and one side of the front always locked up if you pressed the brake pedal to much.

[69Z28-RS]

Did 69s ever come with manual disc brakes?

I ask because I knew a guy when I was a kid that tried to convert his manual disc brakes to power disc brakes by just adding a brake booster and vacuum line. It never worked right and one side of the front always locked up if you pressed the brake pedal to much.

'69 Chevelles could be ordered with non-power front disk brakes...  so I suspect Camaros as well...

[william]

No non-power discs for Camaro in '68 and '69.

[Rufcar]

May 2022 51000 views later and the old Camaro brakes are still holding up perfectly.  In fact better than ever.  That adjustable valve was the best 30 bucks I ever sent.