Master Cylinder Sizing
06-10-2008, 06:46 AM
#14
Member
CRAFTSMAN
Join Date: Apr 2006
Posts: 57
Originally Posted by dak697
I was at the track this weekend and looked at SG roadster... Willwoods up front and Metrics in the back...I talked to the guy and he says the thing stops great.. Uses a factory GM Mastercylinder an aluminum one. Has a portioning valve for biased and has residual valves in line.. The only thing that he has to do every day is gets in the car and pumps the brakes up. He said the petal is soft if it sits overnight or for a couple of days. he is not sure why.Said that when they first put the brake set up in they blead the brakes trying to get rid of the soft pedal after sitting and it would not clear up. Once he "cycles" the brakes the brakes have lots of pedal and work fine all day. He is going to see if they have a make and model on the master cylinder.
I drive my car on the road and the last thinkg you want is a soft or pedal you have to pump. Return roads come up real fast on some race tracks I have been to.
06-10-2008, 02:55 PM
#17
Senior Member
MASTER BUILDER
Thread Starter
Join Date: Mar 2003
Posts: 127
I talked to the Roadster owner today and asked him about the pumping of brakes and he said that the when he goes down the track and has to stop/slow down there is no pumping of the brakes.
He only does it first thing in the am when he gets in the car. After that the brakes are great, the pedal is not soft and would be comparable to the dragster he owned
He has also been working on the problem and believes it is the Metric calipers opening up over a period of time.
He only does it first thing in the am when he gets in the car. After that the brakes are great, the pedal is not soft and would be comparable to the dragster he owned
He has also been working on the problem and believes it is the Metric calipers opening up over a period of time.
06-11-2008, 08:52 AM
#18
Senior Member
EXPERT BUILDER
Join Date: Jan 2007
Location: atwood,Ky
Posts: 302
imo strange 1"no bigger .now on the rear calipers you need to run a steel line to them and just have a hose coming off the rearend to the frame for travel, if you don't you will have soft pedal issue from the hoses flexing and moving around.good luck
