Disappearing Break Fluid...

[High-C]

This may have been covered before but I need some help. I bought my MM in November with less that 1000 miles on it. At 3000 miles the "Brake" light came on intermittently... I found out that the brake fluid was low and had it refilled. They checked the brake system and found no leaks etc... Last night, at 6000 miles, the same thing happened. I found the reservoir low and refilled it to the MAX line... Where is my brake fluid going? I haven't seen any spots where the car is parked etc and see no leaks around the reservoir. Any thoughts?

[KillJoy]

Inside the Wheels, behind the spokes??? Seriously.

KillJoy

[RoyLPita]

Probably into the brake booster via a leak from the rear seal in the master cylinder. Take it in.

[fastblackmerc]

Probably into the brake booster via a leak from the rear seal in the master cylinder. Take it in.

+1........

[BLACKMARAUDER04]

Should still be under warranty + its a brake issue. Take it to the dealer ASAP.

[MM2004]

This sounds familiar.

I had a 1977 Cougar XR7 that did this and ended up being the Master Cylinder leaking fluid into the booster.

The brake pedal became quite firm in presing down, as well as a brake light coming on.

Get this addressed ASAP!

Mike.

[jgc61sr2002]

I concur take to the dealer ASAP.
The brake fluid level does go down as the brake pads wear, which is normal.
The pads should not be worn with 6K on the odometer.IMO.

[LILALLEYKATT]

The brake fluid will compromise the intergrity if the brake booster diaphram. When and if it starts leaking it causes a vacume leak and lean condition in the engine...Make sure the brake fluid is properly cleaned out of the booster if they dont replace it...

[High-C]

While having my new 4.10's installed last Friday, they found a small leak coming from a small coupling (?) behind the drivers side rear brake. It all seems to be fixed... I also just returned 10 minutes ago from the shop where they checked the new Richmond gears after their 500 mile break-in and had my new Ford Racing M-4033-G1 Aluminum Axle Girdle / Diff Cover installed along with new fluid... The difference in strength and looks between the new Ford Racing and stock is really impressive. :cool: It's too bad that you can't see it from behind like on a mustang. :shake: By the way... she loves the 4.10's and the DR Tune. Those where done thanks to you guys... Now the SS Works Headers and SS Exhaust... I just need to rob a bank or two...
:beer:

[fastblackmerc]

Now the SS Works Headers and SS Exhaust... I just need to rob a bank or two...
:beer:
If you can make a trip down to Atlanta, the cost for an exhaust system isn't that bad.

[KillJoy]

I was here.

KillJoy

[High-C]

If you can make a trip down to Atlanta, the cost for an exhaust system isn't that bad.

I'm just waiting on the headers to arrive... My trip is planned to the south in late May...

[David Morton]

A master cylinder leaking fluid into the booster is easily detected by any experienced mechanic. When the engine shuts down residual fluid will leak down the booster and ruin the paint as well as rust the booster. You have to be blind to miss it. In such a case the booster should be replaced as well. The aftermarket suppliers have a combination booster/cylinder replacement part for just this very condition.

The "mysterious brake fluid loss" explanation is a sign of a bad mechanic. Your gonna have trouble if you stick with this guy.