CJ power brake upgrade - Page 4 - JeepForum.com
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post #46 of 66 Old 07-03-2013, 04:45 PM
stich
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1949 CJ3A 
 
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Quote:
Originally Posted by motiv8ya View Post
This is the route I went with my new build. All new parts and brackets. Bench bleed, install, and done.

http://www.ebay.com/itm/1974-1986-je...d57f18&vxp=mtr
X2. I did exactly the same with my Willys and it worked out great!

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post #47 of 66 Old 07-08-2013, 08:48 AM
imzaza
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Thanks for pointing me in the right direction. Hope to start today on hard lines. Probably going to use CJ block w/ YJ mc/booster.
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post #48 of 66 Old 05-10-2017, 10:49 PM
cjjon7
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Figured this is an appropriate brake thread for my question!

I've got the 95 Astro van hydroboost setup on my cj with a PS pump (Saginaw p pump) from the same class van. Running 11" drums on my ford 9" rearend and stock disks from a 76 Waggy on my D44 front. 33x10.50x15 KM2s is all I am stopping for tires.

Wanted enough brake to offer flexibility of terrain and tire size, but I've achieved more than I was expecting!

The brakes are so responsive and so strong, that it requires concentration when stopping so as to not step on the pedal too hard. No bueno for if the wife wants to drive it around, she'll endo the damn thing in no time!

Question is, what's an appropriate method to tone it down a bit? I've got an adjustable pressure valve from summit on the rear line, but even fully closed the fronts are way strong. Can't even notice that the rears are "turned off". Anyone familiar with a good proportioning valve that will suit this particular situation?

Thanks, Jon E
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post #49 of 66 Old 05-11-2017, 07:13 AM
StoneTower
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You can change the master cylinder out for one with a larger bore. This will require more pedal effort but will make the throw shorter. You could add a spring between the pedal and the dash with your current setup (probably the cheapest and easiest). You could change out the brake pads for some that produce less friction.


Quote:
Originally Posted by cjjon7 View Post
Figured this is an appropriate brake thread for my question!

I've got the 95 Astro van hydroboost setup on my cj with a PS pump (Saginaw p pump) from the same class van. Running 11" drums on my ford 9" rearend and stock disks from a 76 Waggy on my D44 front. 33x10.50x15 KM2s is all I am stopping for tires.

Wanted enough brake to offer flexibility of terrain and tire size, but I've achieved more than I was expecting!

The brakes are so responsive and so strong, that it requires concentration when stopping so as to not step on the pedal too hard. No bueno for if the wife wants to drive it around, she'll endo the damn thing in no time!

Question is, what's an appropriate method to tone it down a bit? I've got an adjustable pressure valve from summit on the rear line, but even fully closed the fronts are way strong. Can't even notice that the rears are "turned off". Anyone familiar with a good proportioning valve that will suit this particular situation?

Thanks, Jon E
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post #50 of 66 Old 05-11-2017, 10:22 AM
skizriz
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Quote:
Originally Posted by StoneTower View Post
You can change the master cylinder out for one with a larger bore. This will require more pedal effort but will make the throw shorter. You could add a spring between the pedal and the dash with your current setup (probably the cheapest and easiest). You could change out the brake pads for some that produce less friction.
Wondering if the bore size isn't too big already? With a short throw, and the assistance of the hydroboost, it's just too touchy.
Smaller bore, with more travel may be the way to go.
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post #51 of 66 Old 05-11-2017, 11:02 AM
cjjon7
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Quote:
Originally Posted by skizriz View Post
Wondering if the bore size isn't too big already? With a short throw, and the assistance of the hydroboost, it's just too touchy.
Smaller bore, with more travel may be the way to go.
It is a very short throw, you are correct. How would I go about swapping the master cylinder on this hydroboost unit...hmm. I guess I would need to figure out another compatible GM vehicle with a hydroboost that likely has a smaller diameter master.

Forgot to mention, the brake line I ran was 1/8", wonder if a similar effect would be felt by upsizing to 3/16"?
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post #52 of 66 Old 05-11-2017, 12:38 PM
skizriz
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Quote:
Originally Posted by cjjon7 View Post

It is a very short throw, you are correct. How would I go about swapping the master cylinder on this hydroboost unit...hmm. I guess I would need to figure out another compatible GM vehicle with a hydroboost that likely has a smaller diameter master.

Forgot to mention, the brake line I ran was 1/8", wonder if a similar effect would be felt by upsizing to 3/16"?
The Corvette mcs are popular to run with HB. You would have to check the Astro size, and compare to the Corvette.
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post #53 of 66 Old 05-11-2017, 03:32 PM
StoneTower
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I would call Vanco Brake.
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post #54 of 66 Old 05-11-2017, 03:47 PM
skizriz
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Some good info here that may help you out. http://www.camaros.net/forums/16-bra.../152269?page=1
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post #55 of 66 Old 05-11-2017, 08:41 PM
cjjon7
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Thanks Skiz,

I think I may pull my power steering pump flow piston out and add a few shims beneath the little nut (reduces output pressure of the pump). I currently have it set at maximum line pressure that saginaw rated the pumps (between 1400-1500 psi) and by adding 3 washers I can get it down to 900-1000 psi which may be just the reduction necessary to keep my face out of the windshield during a hard stop.
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post #56 of 66 Old 05-12-2017, 06:53 PM
dechlin
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I'm running the stock cj master cylinder. I wanted a smaller bore cylinder so I would have more travel on the pedal. I think stock master is 15/16 I think corvette master is 1 1/8. And the Astro is something big like 1 1/4. The cj brake lines should be 1/4 and 3/16. I've never even heard of 1/8 line

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post #57 of 66 Old 05-15-2017, 08:25 AM
cjjon7
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Quote:
Originally Posted by dechlin View Post
I'm running the stock cj master cylinder. I wanted a smaller bore cylinder so I would have more travel on the pedal. I think stock master is 15/16 I think corvette master is 1 1/8. And the Astro is something big like 1 1/4. The cj brake lines should be 1/4 and 3/16. I've never even heard of 1/8 line

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Hmm I thought it was 1/8" I will have to look again. If not it must all be 3/16. You have the stock CJ master on the astro hydroboost unit? Wasn't aware that they would mate up. How does that affect the pushrod length from the pedal if at all? That as you know is the bit of fab work that was required when installing the HB unit.
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post #58 of 66 Old 05-15-2017, 09:07 AM
dechlin
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Quote:
Originally Posted by cjjon7 View Post
Hmm I thought it was 1/8" I will have to look again. If not it must all be 3/16. You have the stock CJ master on the astro hydroboost unit? Wasn't aware that they would mate up. How does that affect the pushrod length from the pedal if at all? That as you know is the bit of fab work that was required when installing the HB unit.
Actually there's a guy that was selling brackets on eBay that mount the hydroboost unit to the fire wall without having to cut the pushrod

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post #59 of 66 Old 05-15-2017, 09:47 AM
JeepdaddyRC
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Can you provide some additional info about the brake line extensions and couplers you used to the MC please?
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post #60 of 66 Old 05-15-2017, 09:56 AM
dechlin
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Quote:
Originally Posted by JeepdaddyRC View Post
Can you provide some additional info about the brake line extensions and couplers you used to the MC please?
Just a couple of pieces of brake line I made out of nickle copper line. I tried to unwind the coils and thought it looked like crap so I cut then off and flaired the lines and put unions in

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