View Full Version : Heavy Clutch Pedal

06-21-2006, 01:59 PM
Iíve replaced the clutch in my TR4 (has a TR4A set-up). The parts were purchased aprox. six years ago and consisted of pressure plate, clutch disk, pilot bearing, t/o bearing, sleeve, fork pin, slave (7/8Ē), M/C (Girling ĺ). The system has been bled completely and the line is in good condition. The slave is installed in the correct position and Iíve tried using the middle and lower hole on the cross shaft. Using dot 5 oil.
Itís been so long since I pulled the car apart that I donít remember the size of the old M/C and slave. Has anyone got any ideas for a softer pedal pressure?

Thanks for your time

06-21-2006, 07:33 PM
Hi Bill,
It's the nature of the beast. You did not mention the brand pressure plate used. There were some minor differances in pedal pressure between them. I'm not sure if the Sachs pressure plate would fit the TR4 though.
Using the lower hole might make the pedal pressure a bit easier but might affect clutch engaugement. The original design leaves alot to be desired. A new hydraulic set up will be easier but it's pricey & requiers pulling it all apart again.

Get a gym membership , it's easier

Paul Johnson
06-21-2006, 09:43 PM
At the port of entry, every car went through a wash to remove the cosmoline before being sent to dealers. Every TR6, I think, that came out of there, left a foot or so of rubber on the asphalt. It was because the "clutch pedal is so heavy my foot slipped".

06-22-2006, 01:13 AM
I had a similar problem with a Spitfire MkIV. The master and slave cylinders were mis-matched. The clutch felt like a block of wood. It would work but only with great effort. I replaced the master with the correct one for my car and this solved the problem.

06-22-2006, 01:08 PM
Thanks for the replys. I've herd some people have used a 1" slave. Are they still available?


06-22-2006, 01:34 PM
Hay Bruno I once had that problem on a tr3 when I put a 7/8 slave cylinder on instead of the 1 inch that is used on tr3/early tr4 that bad boy got so hard a cat could not scratch it. I went back and rebuilt my 1 inch slave and the pedal was much much easier to push down.

06-22-2006, 02:03 PM
I was reading this and wondered how much difference there was and found it was more than I thought.

7/8" = .60095 in sq
1" = .78498 in sq