I have a 68 E-Tye that I have just completed a 2 1/2 year restoration. I had the brake master cylinder bored & sleeved. I had rebuilt the servo unit several years ago. Anyway, I have started driving her again and the brake fluid from the rear resrvoir is "disappearing". I remember from the past that the vacuum can bleed off the fluid and that the servo needs to be rebuilt. Before I start on a disassembly of the M/C and servo, I welcome any other suggestions. (No fluid underneath or wet spots around connections, wheel cylinders, etc.)

Submitted by SE12-44804 on Fri, 10/03/2008 - 08:29

I used Apple Hydraulics in NY, I believe. I will have to look at some old receipts. I know that I used them for the carbs. You may want to see what XK's Unlimited has to offer. I ended up buying a new servo unit from them and problem solved.

Submitted by SE12-44804 on Sun, 02/03/2008 - 21:29

I just refitted the servo unit after a rebuild and went for a cruise today. I am in VA and it was 61 degrees today. Wam for February. Did I mention it is a ragtop? Anyway, rebuild worked.

Submitted by teg9222@comcast.net on Tue, 01/08/2008 - 22:17

I had this disappearing brake fluid problem on my 68 E-Type and it turned out that the bfluid was filling up the black brake vacuum bottle. I had the brake booster re-built and replaced the master cylinder which fixxed the problem. Good luck, Dan-Presently own a 1970 E-Type Coupe (and wish I had some of the Jags I formerly owned).

Submitted by NC19-03320J on Tue, 01/08/2008 - 22:02

If you are losing brake fluid from the back reservoir and there are no leaks then you've got a bad seal in the rear of the brake servo. You'll find the missing fluid in the servo tank when you get it apart. This is not an uncommon problem.

Submitted by lonniemcminn@c… on Tue, 01/08/2008 - 21:22

I am experiencing the exact same scenario. Brand new master cyclinder, no signs of fluid anywhere. I have bled the front brakes (rear bottle) both times this has happened. Back in business again only to loose 3/4 of the bottle. Next idea was start removing the vacuum line and looking for moisture back into the servo there as brake fluid certainly would not evaporate.

Lonnie
1966 XKE 2+2

Submitted by SC38-21185J on Tue, 01/08/2008 - 20:43

That's wierd. But it HAS to be going somewhere...either filling a void in your system or simply evaporating out of the reservoir. I would keep topping it up until it stops or until something leaks. Perhaps re-bleed the back brakes?

Patrick McLoad