Author Topic: 69 RF brake lock up?  (Read 9019 times)

69Z28-RS

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Re: 69 RF brake lock up?
« Reply #45 on: December 10, 2016, 07:24:42 PM »
If it's a factory backing plate, there will be an opening, but it may have a dust seal pressed into place...  The hole should be directly behind the adjuster wheel.  look for the rubber plug and remove it...
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

Rufcar

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Re: 69 RF brake lock up?
« Reply #46 on: December 10, 2016, 09:56:22 PM »
Ok up date! Rear Right cyl. leaking. Replaced and cleaned. Brake shoes adjust internally there is NO seal, probably because its a 70 or 71 Nova rear! Who knew? I ran the serial number on the axel. Cleaned both sides. Adjusted by putting drum on and off using adjuster. Car stops perfectly now! YEA! Tkx for all your advice.

For the record here is my 400hp camaro
« Last Edit: December 10, 2016, 10:22:38 PM by Rufcar »

JKZ27

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Re: 69 RF brake lock up?
« Reply #47 on: December 10, 2016, 10:44:00 PM »
Fixed!!!  :D
Good for you!
John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20

Sauron327

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Re: 69 RF brake lock up?
« Reply #48 on: December 10, 2016, 11:09:05 PM »
I can only assume since one wheel cylinder was leaking the other is tired, as well as the rear flex line. if that collapses, your rears will lock up again.

Paint your grille surround orange the way it is supposed to be originally. If you so desire of course.


Rufcar

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Re: 69 RF brake lock up?
« Reply #49 on: December 10, 2016, 11:25:46 PM »
Sauron327 Tkx the other cyl is new. Not much stock on this car in many years. That's why I bought and built it the way I wanted, though I did use all GM parts that were available in 69. I built one similar in 1970 with same side exhaust. If it was original id keep it that way. Tkx

Rufcar

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Re: 69 RF brake lock up?
« Reply #50 on: December 11, 2016, 02:39:54 PM »
Here is the pic of the old metering valve and new plumbing. Tkx again for all the advice and what makes this forum great!  Merry xmas. Now off to finish up my 70 Chevelle project! Jim F

Rufcar

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Re: 69 RF brake lock up?
« Reply #51 on: December 12, 2016, 09:47:27 PM »
Took her out today around the property and it seems the RF is locking up again except I need to brake harder to do that. I think it may be the old metering valve I installed. I did clean it up and blow it out and it seems to work with 35lbs of air pressure. Your thoughts?

z28z11

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Re: 69 RF brake lock up?
« Reply #52 on: December 13, 2016, 02:20:39 PM »
Look up the thread(s) on the site for the metering valve rebuild protocol. You can order the kit and rebuild it yourself, pretty simple and inexpensive procedure. Both proportioning and metering units should be up to snuff - you can do both -

Regards,
Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

Rufcar

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Re: 69 RF brake lock up?
« Reply #53 on: December 13, 2016, 03:37:02 PM »
Tkx steve will do. Jim

1969Z27

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Re: 69 RF brake lock up?
« Reply #54 on: December 13, 2016, 11:58:17 PM »
Seems like you're unsure which wheel is locking up? I'd get a helper to watch from outside of car to verify which wheel is locking.
Russ 
68 RS L22/M20
69 SS L48/MC1

Rufcar

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Re: 69 RF brake lock up?
« Reply #55 on: December 14, 2016, 03:16:10 AM »
I did it's def. Rf. Again.

1969Z27

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Re: 69 RF brake lock up?
« Reply #56 on: December 16, 2016, 12:28:15 AM »
Hi Jim. In post #50. Is that some kind of adapter in master cylinder that the front line is screwed into?
Russ 
68 RS L22/M20
69 SS L48/MC1

Rufcar

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Re: 69 RF brake lock up?
« Reply #57 on: December 16, 2016, 12:44:46 AM »
Nope it's mstr cyl to metering valve. Then rear of metering valve to distribution block as per pic in crg factory pic.

Sauron327

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Re: 69 RF brake lock up?
« Reply #58 on: December 16, 2016, 02:06:57 AM »
Hi Jim. In post #50. Is that some kind of adapter in master cylinder that the front line is screwed into?
To me it looks like adapters used with incorrect lines. I've used them before in other applications when using universal brake lines. Complete adapter lines are also now available for repairs. Since all the correct pre-bent factory lines are available for these cars, there is no need for adapters. They don't affect the braking, they just do not look original.

Rufcar

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Re: 69 RF brake lock up?
« Reply #59 on: December 16, 2016, 03:02:25 AM »
Sauron, I agree. It,was all I had as I just wanted to see if the system worked.  Hopefully tomorrow my new meter valve Will be,here as I was not able to cancel the order.