Master Cylinder Leaking Suddenly
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Mountain Pass
Joined: Dec 2014
Posts: 219
Likes: 7
From: Pennsylvania
Master Cylinder Leaking Suddenly
Took my truck into a new tire center yesterday to have a rear tire replaced. Unfortunately I wasn’t able to see inside the shop but I’m pretty certain they put it on a lift.
I get the truck back after and I have no brake pedal. I bring it back and they tell me they didn’t hit any brake lines with their jack/lift.
It turns out my slightly over a year old master cylinder is leaking fluid where it meets the brake booster. Can hear it hiss when pushing the pedal with the engine off.
Would them hitting a line with their jack and pinching it cause the seal in the master to blow? The rear lines on the axle and to the calipers look ok. I’m a little puzzled and am trying to figure out if the master just decided to go out then and there or they caused it.
I called the shop that installed the new master and unfortunately it’s out of warranty. I also checked to confirm it’s a new Ford master and not a reman.
I get the truck back after and I have no brake pedal. I bring it back and they tell me they didn’t hit any brake lines with their jack/lift.
It turns out my slightly over a year old master cylinder is leaking fluid where it meets the brake booster. Can hear it hiss when pushing the pedal with the engine off.
Would them hitting a line with their jack and pinching it cause the seal in the master to blow? The rear lines on the axle and to the calipers look ok. I’m a little puzzled and am trying to figure out if the master just decided to go out then and there or they caused it.
I called the shop that installed the new master and unfortunately it’s out of warranty. I also checked to confirm it’s a new Ford master and not a reman.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Pinching a line wouldn't have any effect on the master I can imagine. The system basically deadheads at the calipers every time the pedal is applied already. Pinching a hard line off is and old school roadside temporary fix. It ruins the line, but will seal off any downstream leaks and let you limp home/parts store.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
There's no way possible for a master cylinder to be ruined, either accidentally or otherwise, simply by putting a vehicle on a lift and changing tires. What you have is a short-lived replacement part. Too bad it was a Ford part, but on a side note, last year I replaced every hose and the coolant expansion tank on my '99 7.3. Bought the coolant tank directly from the local dealer because I wanted OE. Paid big bucks for it, too. It failed. Sprayed coolant all over the passenger side battery. Warranty part also failed, and in exactly the same spot. Bought an aftermarket tank and it's holding just fine. Parts guy didn't like it, but I got my money back for it.
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