My brakes suck

itbrokeagain · 03-30-2010, 09:36 PM

On my Yj I have 3/4 ton chevy calipers on the rear. I have a 67 vette master bolted to the firewall. Master cyl and front and rear calipers are brand new. Master was bench bled and I bled everything then gravity bled it all to make sure. I dont get a great pedal. Does anyone know of anything OEM I can bolt to my brake booster that will work well? It would be great to get power brakes back and have them work. Will a Rubicon master fit a Yj brake booster? I havent had good brakes for about 6 years so I am ready to try something different.

94Dodge Truggy · 03-30-2010, 09:53 PM

I run 1 ton dodge ram master cyl. and booster with good luck. 95 to 99. Adjustable proportioning valve and rear disc brakes! Wonder if calipers are shot?

mckeddie · 03-30-2010, 09:53 PM

i don't remember the exact year, but i believe it is a 86 ford van master cylinder will work. i have it bookmarked somewhere, and will try to find it. i need to do the same thing, i've never had a solid pedal either, it will lock up the tires, but it has always felt super soft.

greg

carwash · 03-30-2010, 11:08 PM

To stiffen the pedal, you need larger bore on the cylinder. 3/4 to 7/8 or 7/8 to 1" makes a world of difference in pedal feel. Figure out what you have first, and go from there. A one ton master from a truck will stiffen you up, but might be too much. '

Look at the application and in your mind imagine how much fluid has to be pushed to fill the wheel cylinders / calipers on the system. find one that you think matches yours as close as possible.

Or bite the bullet and put a wilwood system in.

itbrokeagain · 03-30-2010, 11:14 PM

Quote:

Originally Posted by carwash

To stiffen the pedal, you need larger bore on the cylinder. 3/4 to 7/8 or 7/8 to 1" makes a world of difference in pedal feel. Figure out what you have first, and go from there. A one ton master from a truck will stiffen you up, but might be too much. '

Look at the application and in your mind imagine how much fluid has to be pushed to fill the wheel cylinders / calipers on the system. find one that you think matches yours as close as possible.

Or bite the bullet and put a wilwood system in.

This is why I called you earlier. I know the pumpkin had this same setup and I thought it worked great for you.

carwash · 03-30-2010, 11:58 PM

Sorry I missed your call, I was eating dinner and forgot to call back. The pumpkin's brakes were ok, nothing stellar. I used the master for the car with 4 wheel disc MANUAL brakes. Makes a little difference. I'm not a fan of power brakes, so that would be the first thing I would lose. I imagine you have the cylinder for power brakes, as i recall you saying it was less than $20, and that is the power one. The manual one runs around $40-50. The manual has a larger bore, so it pushes more fluid. It doesn't matter how hard it pushes the fluid if there isn't enough there to fill the void it needs to.

Waffle · 03-31-2010, 12:47 AM

http://www.pirate4x4.com/tech/billavista/Brakes/
You might be better off looking at Billavista's brake bible. You need to start with matching the master to the front calipers and then go from there either up or down in size. There's a crazy amount of info in it. What's the bore size of your master? Front caliper piston surface area? blah, blah, blah.

If I remember right, vette masters are at best 1" bore. 1/2 ton and 3/4 ton calipers are the exact same. Only the rotor is different. I've got this setup front and back running a 1-1/8" master with 40's and love it. This was after ditching the 1".

don't go too large though. Larger=more volume and less pressure. (Hard thigh burning pedal but not enough pressure to stop)

03-30-2010, 09:36 PM	#1
itbrokeagain Just Empty Every Pocket - CORE Member - Join Date: Feb 2007 Location: Amelia Posts: 1,435	My brakes suck On my Yj I have 3/4 ton chevy calipers on the rear. I have a 67 vette master bolted to the firewall. Master cyl and front and rear calipers are brand new. Master was bench bled and I bled everything then gravity bled it all to make sure. I dont get a great pedal. Does anyone know of anything OEM I can bolt to my brake booster that will work well? It would be great to get power brakes back and have them work. Will a Rubicon master fit a Yj brake booster? I havent had good brakes for about 6 years so I am ready to try something different. __________________ 91 fj 80 on 37 Nitto Muds with a 10k winch. Cage and sliders coming soon.

03-30-2010, 09:53 PM	#2
94Dodge Truggy EX-Vice President Join Date: Jan 2007 Location: Fairfield, Ohio Posts: 3,048	I run 1 ton dodge ram master cyl. and booster with good luck. 95 to 99. Adjustable proportioning valve and rear disc brakes! Wonder if calipers are shot? __________________

03-30-2010, 09:53 PM	#3
mckeddie Join Date: Apr 2007 Location: van wert oh Posts: 583	i don't remember the exact year, but i believe it is a 86 ford van master cylinder will work. i have it bookmarked somewhere, and will try to find it. i need to do the same thing, i've never had a solid pedal either, it will lock up the tires, but it has always felt super soft. greg __________________ zuk buggy.....it'll be a jeep eventually.

03-30-2010, 11:08 PM	#4
carwash pimpin' IS easy Join Date: Jan 2007 Location: Union, KY Posts: 3,344 Images: 605	To stiffen the pedal, you need larger bore on the cylinder. 3/4 to 7/8 or 7/8 to 1" makes a world of difference in pedal feel. Figure out what you have first, and go from there. A one ton master from a truck will stiffen you up, but might be too much. ' Look at the application and in your mind imagine how much fluid has to be pushed to fill the wheel cylinders / calipers on the system. find one that you think matches yours as close as possible. Or bite the bullet and put a wilwood system in. __________________

03-30-2010, 11:58 PM	#6
carwash pimpin' IS easy Join Date: Jan 2007 Location: Union, KY Posts: 3,344 Images: 605	Sorry I missed your call, I was eating dinner and forgot to call back. The pumpkin's brakes were ok, nothing stellar. I used the master for the car with 4 wheel disc MANUAL brakes. Makes a little difference. I'm not a fan of power brakes, so that would be the first thing I would lose. I imagine you have the cylinder for power brakes, as i recall you saying it was less than $20, and that is the power one. The manual one runs around $40-50. The manual has a larger bore, so it pushes more fluid. It doesn't matter how hard it pushes the fluid if there isn't enough there to fill the void it needs to. __________________

03-31-2010, 12:47 AM	#7
Waffle Join Date: Aug 2009 Location: . Posts: 75 Images: 10	http://www.pirate4x4.com/tech/billavista/Brakes/ You might be better off looking at Billavista's brake bible. You need to start with matching the master to the front calipers and then go from there either up or down in size. There's a crazy amount of info in it. What's the bore size of your master? Front caliper piston surface area? blah, blah, blah. If I remember right, vette masters are at best 1" bore. 1/2 ton and 3/4 ton calipers are the exact same. Only the rotor is different. I've got this setup front and back running a 1-1/8" master with 40's and love it. This was after ditching the 1". don't go too large though. Larger=more volume and less pressure. (Hard thigh burning pedal but not enough pressure to stop) Last edited by Waffle; 03-31-2010 at 12:57 AM.