Possible brake issue - ZR-1 Net Registry Forums

Jim Nolan · 07-05-2012

I took the Z out for some exercise yesterday and had a problem. After 20 minutes on the road it started to bog down in 5th gear at 60 mph, I down shifted and still bogged down, power key on. I pulled off the road clutch in and when I applied the brake the pedal was all the way up and stiff with no cushion, rock hard. I backed up about 50' and everything seemed normal. The brake pedal felt normal also.

I drove about another 10 miles gassed up and was on the way home and the same thing happened again. I backed up with the same results. Either time it did not pull to either side. I spent the rest of the afternoon reading up in the service manual. The only thing I could figure out is that the master cyclinder is failing or the proportioning valve is going bad and appyling pressure to the rear. No codes were set in any of the systems.

Any thoughts.

Thanks!

Jim

07-05-2012	#1
Jim Nolan Join Date: Jan 2007 Location: Florida Posts: 241	Possible brake issue I took the Z out for some exercise yesterday and had a problem. After 20 minutes on the road it started to bog down in 5th gear at 60 mph, I down shifted and still bogged down, power key on. I pulled off the road clutch in and when I applied the brake the pedal was all the way up and stiff with no cushion, rock hard. I backed up about 50' and everything seemed normal. The brake pedal felt normal also. I drove about another 10 miles gassed up and was on the way home and the same thing happened again. I backed up with the same results. Either time it did not pull to either side. I spent the rest of the afternoon reading up in the service manual. The only thing I could figure out is that the master cyclinder is failing or the proportioning valve is going bad and appyling pressure to the rear. No codes were set in any of the systems. Any thoughts. Thanks! Jim Last edited by Jim Nolan; 07-05-2012 at 11:42 AM.