My daugther loves her Jag but we continually have problems, two fuel pumps, new exhaust, new bearings and such not, after many thousands of dollars at the Jag dealer, it has developed a brakeage problem, the dealer said the brake booster had a leak, so instead of a thousand dollar repair bill, i ordered the part and it is here, my question is how hard is it to replace? I'm no mechanic but can do simple things, would i be biting off more than I can chew? Trying to locate a step by step instruction but to no avail, relying on your expertise as to wether I should jump into it, I personally want to, figuring if I really screw it up, i can always take it to the dealer. Your thoughts? Oh, and its a XJ6 Series III
RE: 1983 Jaguar Brake Booster
Essentially it felt like all the power out of the braking system was gone, it would stop after some distance and alot of pressure. Lets say it would slow to a stop, not a actual brake stop. Going 30 miles per hour maybe 1/2 mile before it would stop, while putting alot of pressure on the brake pedal.
Greetings,
Those boosters rarely fail, the usual symptom is that you can hear a steady vacuum leak when you keep pressure on the pedal.
In the event you are going to change it: unbolt the master cylinder, you do not have to disconnect the fluid pipes unless you choose to. You have to remove the booster with the complete pedal box assembly, by removing the retaining nuts from inside the footwell. With the removed pedal box inverted, you can see how the booster pushrod attaches to the pedal. It's not a too difficult ajob. Best wishes
Those boosters rarely fail, the usual symptom is that you can hear a steady vacuum leak when you keep pressure on the pedal.
In the event you are going to change it: unbolt the master cylinder, you do not have to disconnect the fluid pipes unless you choose to. You have to remove the booster with the complete pedal box assembly, by removing the retaining nuts from inside the footwell. With the removed pedal box inverted, you can see how the booster pushrod attaches to the pedal. It's not a too difficult ajob. Best wishes
RE: 1983 Jaguar Brake Booster
I was assuming it was the brake booster since the local dealer had told me that, i will try to replace any vacuum hose that coincides with the braking system, they would be located near the booster wouldn't they?
Follow thehose back from the booster, to the pipeacross the engine bay braces, to the intake manifold. There is a one way vacuum check valve for the booster vac. supply. On early XJ6, they screw directly into the manifold. These used to fail, particularly from icing when cold: the later cars used a plastic check valve installed in the hose from a fitting on the intake. Earlier cars were supposed to be retrofitted, there is an ancient TSB on the subject.
If the fault is indeed related to your booster, the brake pedal should feel firm as stepping on a rock, with little pedal travel.
If the fault is indeed related to your booster, the brake pedal should feel firm as stepping on a rock, with little pedal travel.
RE: 1983 Jaguar Brake Booster
I will check on that tonight and post tomorrow, thanks for all the info.... I was wondering if it was a vacuum type thing, after all the dealer had said but it has sat for a month since then (awaiting a part) and no visible leakage that I can see around the booster. I will check tonight and post tomorrow Thanks again