Rear disc upgrade. M/C too? - Team Camaro Tech
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post #1 of 16 (permalink) Old May 24th, 19, 09:56 AM Thread Starter
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Brad
 
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Rear disc upgrade. M/C too?

I currently have power disc front drum rear on my 68. Im upgrading to rear disc. I know I have to change the proportioning valve, but do I need to change master cylinders as well. I can seem to find a clear answer.

1968 Camaro SS (most likely clone), Coupe 350/TH400 (original 4 spd), 12 bolt, FiTech Easy Street.
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post #2 of 16 (permalink) Old May 24th, 19, 10:25 AM
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Re: Rear disc upgrade. M/C too?

I hope you are not using those metric Cadillac rear brakes. They suck big time....

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
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post #3 of 16 (permalink) Old May 24th, 19, 10:41 AM Thread Starter
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Quote:
Originally Posted by dhutton View Post
I hope you are not using those metric Cadillac rear brakes. They suck big time....

Don
Unfortunately, I discovered a cracked spring perch weld, that started leaking after I cleaned the area and a slightly bent rear axle. Guessing the PO hit a curb. I’m replacing it with a new Moser 12 bolt, I haven’t decided if I’m using their economy brake kit or the Wilwood kit.

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post #4 of 16 (permalink) Old May 24th, 19, 10:49 AM
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Re: Rear disc upgrade. M/C too?

If those economy brakes are metric Cadillac calipers just say no.....

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
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post #5 of 16 (permalink) Old May 24th, 19, 11:43 AM
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Re: Rear disc upgrade. M/C too?

If you change from disc/drum to disc/disc you will need a different MC

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post #6 of 16 (permalink) Old May 24th, 19, 11:44 AM
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Re: Rear disc upgrade. M/C too?

The Caddy Metric work fine if you adjust them correctly. You have to adjust the E-brake before you bleed the calipers.

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post #7 of 16 (permalink) Old May 24th, 19, 12:33 PM
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Re: Rear disc upgrade. M/C too?

Quote:
Originally Posted by Vega$69 View Post
The Caddy Metric work fine if you adjust them correctly. You have to adjust the E-brake before you bleed the calipers.
I think my Right Stuff Detailing big brake kit came with the rear Caddy metrics but I have not installed them yet. Are they really that bad?

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post #8 of 16 (permalink) Old May 24th, 19, 12:40 PM
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Whatever you get, get a floating caliper if you do not have floating rear axles.
I had the metrics. They worked. But I hated adjusting them.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
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Budnik wheels

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post #9 of 16 (permalink) Old May 24th, 19, 02:18 PM
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Re: Rear disc upgrade. M/C too?

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Originally Posted by ilikeike View Post
Whatever you get, get a floating caliper if you do not have floating rear axles.
I had the metrics. They worked. But I hated adjusting them.
You only adjust them when you 1st install them. Everyone I know of that had a problem is because they did not follow the instructions and adjust the e-brake 1st.

GM put them on 100s of thousands of cars over the years.

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post #10 of 16 (permalink) Old May 24th, 19, 02:43 PM
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Quote:
Originally Posted by Vega$69 View Post
Quote:
Originally Posted by ilikeike View Post
Whatever you get, get a floating caliper if you do not have floating rear axles.
I had the metrics. They worked. But I hated adjusting them.
You only adjust them when you 1st install them. Everyone I know of that had a problem is because they did not follow the instructions and adjust the e-brake 1st.

GM put them on 100s of thousands of cars over the years.

I agree.
It dose take some experience to get those things right.
I figured mine out and had them working fine, but there definitely was a learning curve. I took one caliper completely apart to real understand what was going on with the rachet BS E-brake. I figured it out.
Still, Much ! easier to have the disc with a separate drum e brake.

Like I always say after I complain about them, they work.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
Global West arms
Budnik wheels

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post #11 of 16 (permalink) Old May 24th, 19, 04:45 PM
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Re: Rear disc upgrade. M/C too?

The 1998-2002 Camaro disks are a drum-in-hat design that has a much stronger parking brake.

The only problem is you need two left side backing plates from a junkyard.

68 Camaro convertible, 6.0 LQ4 with LS3 heads, Vintage Air, 750 street demon carb, eddy perf rpm, GM hot cam, Hooker headers, 4L80e, 12 bolt, 3.55 gears
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post #12 of 16 (permalink) Old May 24th, 19, 04:56 PM Thread Starter
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The Wilwood upgrade is about $250. Maybe I’ll go that route.

Thanks for the info on the MC

1968 Camaro SS (most likely clone), Coupe 350/TH400 (original 4 spd), 12 bolt, FiTech Easy Street.
A driving work in progress
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post #13 of 16 (permalink) Old May 25th, 19, 05:26 AM
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Re: Rear disc upgrade. M/C too?

Quote:
Originally Posted by ilikeike View Post
I agree.
It dose take some experience to get those things right.
I figured mine out and had them working fine, but there definitely was a learning curve. I took one caliper completely apart to real understand what was going on with the rachet BS E-brake. I figured it out.
Still, Much ! easier to have the disc with a separate drum e brake.

Like I always say after I complain about them, they work.
I recently had these rear discs installed on my 67 with a new Moser rear end. I have been trying to find the installation instructions and have had no luck. I contacted Moser and they sent me a link to the right stuff web site. If anyone has the instructions they can post a link to I would greatly appreciate it. I want to know how they work and what I can do to adjust them. My car pulls slightly to the left when first applying the brakes and I want to know how to work on these myself. I also have the E brake option. My front brakes are factory 1969 Camaro disc brakes.
Thanks in advance

Dave

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post #14 of 16 (permalink) Old May 25th, 19, 09:30 AM
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Hear are another version of instructions that may help. . https://www.jegs.com/installationins...610_630611.pdf

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
Global West arms
Budnik wheels

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post #15 of 16 (permalink) Old May 27th, 19, 09:10 AM
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Quote:
Originally Posted by ilikeike View Post
Hear are another version of instructions that may help. . https://www.jegs.com/installationins...610_630611.pdf
Thanks! Exactly what I was looking for.

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