Joined: Fri Mar 13 2009, 11:21AM
Location: San Marcos, CA
Posts: 713
Hi all, My son has a '69 Coronet 440 that has 10" brakes, he has large tires on the rear and Wilwood front disk brake conversion on the front. It has 15/16" rear wheel cylinders on it now. We would like to get 1 1/16" rear wheel cylinders on it. Does anyone know an application or part number for a direct replacement larger wheel cylinder? Thanks
Joined: Wed Nov 17 2010, 03:28PM
Location: florida
Posts: 1311
Look up article in mopar action june 2013. Alot of info on this and if i remember correctly, larger is not the way to go. Rockauto.com also lists all cylinders compatible for mopars
Joined: Fri Mar 13 2009, 11:21AM
Location: San Marcos, CA
Posts: 713
Thanks for the link... The 15/16 is what is on the car. I think replacing the proportioning valve may be the ticket. BTW I put larger wheel cylinders on my '96 Dodge 2500 HD 4X4 and it made a HUGE difference in its braking (15/16 to 1 1/8), very progressive and much more stopping power.
Joined: Sun Jan 07 2007, 07:37PM
Location: London,Ontario
Posts: 166
Cars that go fast need to stop fast ( and reliably ). Been there, done that. I installed hydro boost system and never looked back. In your case, Wilwood's matched to the right master should be adequate for the front calipers. Out back the cylinder size you want to use will take up too much of the stroke of the master just to get the volume of fluid back there. You could install a residual valve in the rear line to keep the shoes closer to the drums.
Joined: Sun Jan 07 2007, 07:37PM
Location: London,Ontario
Posts: 166
Cars that go fast need to stop fast ( and reliably ). Been there, done that. I installed hydro boost system and never looked back. In your case, Wilwood's matched to the right master should be adequate for the front calipers. Out back the cylinder size you want to use will take up too much of the stroke of the master just to get the volume of fluid back there. You could install a residual valve in the rear line to keep the shoes closer to the drums. Rear brakes do only 20% of the braking and really only lessen "nose dive" and keep the back from "coming around" under panic stops.
Joined: Fri Mar 13 2009, 11:21AM
Location: San Marcos, CA
Posts: 713
The car has 235 tires on the front and 275 on the back, we were hoping to get the 10" rear brakes to work a little harder. The car has an 8 1/4 rear end, the plan is to put a lot more under the hood so an 8 3/4 or 9 3/4 under the car, we will get 11" brakes at that point, that will get more braking in the rear. Did you need to put a different pump or were you able to use the stock power steering pump for the hydro boost setup? Thanks for the thoughts!