Lotus Elan

Brake fluid leak

PostPost by: Lotus 50 » Sat Sep 30, 2017 10:47 pm

I had to fill my brake reservoir a few weeks and about 400 miles ago. The brake pedal went to the floor without slowing the car. I bought som DOT fluid and filled the reservoir. Then I had it towed to a brake shop. They put it on a lift and could find no leaks? So I drove it home. Master cylinder leak? Slow leak elsewhere?
Lotus 50
Second Gear
Second Gear
 
Posts: 65
Joined: 07 Jan 2012

PostPost by: mbell » Sat Sep 30, 2017 10:55 pm

Do you have a brake booster?

If so they are normally the most troublesome part of brakes. Not un known for brake fluid to be sucked into the engine intake from a faulty booster...
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1641
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

PostPost by: Lotus 50 » Sun Oct 01, 2017 2:09 am

Yes there is a brake booster
Lotus 50
Second Gear
Second Gear
 
Posts: 65
Joined: 07 Jan 2012

PostPost by: alan.barker » Sun Oct 01, 2017 7:53 am

+1 servo
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
alan.barker
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2296
Joined: 06 Dec 2008
Location: BRITTANY FRANCE

PostPost by: rgh0 » Sun Oct 01, 2017 10:30 am

Most likely be leaks into the booster vacuum chamber but also look for leaks from master cylinder into the footwell being hidden by the carpets.

cheers
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7487
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: Lotus 50 » Sun Oct 01, 2017 6:28 pm

A woman in a Mercedes tested my brakes an hour ago. I can still lock all 4 wheels. I will look under the carpet.
Lotus 50
Second Gear
Second Gear
 
Posts: 65
Joined: 07 Jan 2012

PostPost by: mbell » Sun Oct 01, 2017 10:06 pm

I'd also pull the brake booster vacuum line and see if there any signs in it fluid.

Glad they still working when you need them. Hopefully you have a very loud horn, horn loudness should be inversely portion to car size...
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
mbell
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1641
Joined: 07 Jun 2013
Location: Austin, TX (UK Ex-pat)

PostPost by: Bigbaldybloke » Mon Oct 02, 2017 12:20 am

I had a problem years ago where the brakes almost failed and I had had to top up the reservoir several times prior to that but could find no signs of any leaks. On removing the brake servo about half a pint of brake fluid ran out when I loosened the screws on the vacuum part of the servo. The seals had failed in it and the fluid was leaking from the liquid side to the vacuum side of the servo. It was relatively simple to rebuild with new seals, mine was a Girling one, and from memory I needed to bend a bit of coat hanger wire into a special shape to facilitate the rebuild, but the instructions were in the rebuild seal kit.
Change is inevitable, except from a vending machine!
Bigbaldybloke
Fourth Gear
Fourth Gear
 
Posts: 661
Joined: 16 May 2017
Location: Lincolnshire

PostPost by: Bigbaldybloke » Mon Oct 02, 2017 12:26 am

Just another comment, the vacuum line normally comes off the top of the servo so until there is a lot of brake fluid in the vacuum side of the servo you are unlikely to find much (if any) getting into the inlet manifold. Certainly there was no trace in my car when the servo failed.
Change is inevitable, except from a vending machine!
Bigbaldybloke
Fourth Gear
Fourth Gear
 
Posts: 661
Joined: 16 May 2017
Location: Lincolnshire

PostPost by: TeeJay » Wed Oct 04, 2017 5:56 pm

I also had the same scary experience, many years ago, of the servo failing, which resulted in pedal to the floor and no brakes. :shock:

Pumping the pedal resulted in some brakes. Slow drive home, filled reservoir and seemed ok, but some days later brakes failed again. Car off the road to find the fault.

It was as others have said, brake fluid in the vacuum cylinder.

Mine was a Girling Mark2A, so purchased a repair kit and sorted the problem.
I tried to attach the Girling Manual, but regrettably the file was too large.

So I have selected 4 pages that illustrate the contents, one page which illustrates the dimensions of the compression tool, which is required as it avoids damage to the bores, if used correctly.
I made mine from the wire of a coat hanger.

So if anyone wants the Girling Manual and/or the Instructions that came with the repair kit, then PM me your email address and I will forward the documents.


Girling Vacuum Servo selected pages.pdf
(918.19 KiB) Downloaded 157 times
Trevor
1968 Elan +2 50/0173
User avatar
TeeJay
Fourth Gear
Fourth Gear
 
Posts: 505
Joined: 30 May 2007
Location: Ranton, Nr Stafford. UK

PostPost by: Bigbaldybloke » Wed Oct 04, 2017 7:16 pm

Just rummaged in my toolbox, bent wire tool still there!
Change is inevitable, except from a vending machine!
Bigbaldybloke
Fourth Gear
Fourth Gear
 
Posts: 661
Joined: 16 May 2017
Location: Lincolnshire

Total Online:

Users browsing this forum: No registered users and 10 guests