Wedge clutch Slave Cylinder

[Wedgehead]

Hi all, The clutch master cal was recently replaced on my 280i (I have been told the 350i and 280i=same same). The master cylinder that was installed was from a tr7, seems "hard" and clutch does not fully disengage so cannot shift into 1st at a standstill. The question is............Is the TR7 clutch master cylinder that was installed the correct part, yes/no?

I'm afraid that it isn't and has changed the mechanical advantage,stroke or ......of the system .

Thanks !!!

[mrzigazaga]

Hi Bruce

I also answered on FB..

Here is a diagram of the clutch system on the later 280i, it describes a fault in respect of the gears not engaging or a sticky clutch being that the actuator arm is not being pushed forward enough....so a fault in the system, what part is from the TR7?...Clutch master?...it is possible that there is a significant difference in applied pressures.

[Wedgehead]

Thanks. Yes, I was hoping someone had done the same in the past and would reply “ tr7 will work or tr7 won’t work, you need xyz”

Or I may be chasing my tail for a while here

[Wedgehead]

I’ll have to look into this further once under the car

[Wedgehead]

I’ll have to measure the “throw”

[adam quantrill]

If the new master is stiffer that means it will be giving a bigger travel at the slave end for the same push at the master end. The only other variable is the volume of each cylinder - the master should be large enough to "fill" the slave.

One thing you can adjust quite quickly is the push rod on the master - try winding it out a few turns so the pedal is higher and therefore definitely bottoms out when depressed.

Also double-check the slave bolts are tight in case there's any slack there, you will get less push.

[Wedgehead]

Yes—thanks. Have to get in there myself. Old owner touched it once or twice. Then s second person—too many cooks