81 brakes
#1
#2
#3
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 6,796
Received 2,399 Likes
on
1,880 Posts
Many if not all brake boosters will fail in time. The one in your car is similar to almost all others. They rely on a diaphragm that is encased in the can.
1. The diaphram can leak and as such no assistance in applying pressure to the master cylinder. Hard pedal, lots of push to get any stopping power.
2. Failec vacumn supply. Not connected. Hose leaks. One way valve stuck in closed position, and as such no manifold vacuum available to aid.
3. Have you vbeen losig brake fluid with no outward signs. If so, it may be drawn iontot he engone and burned via a leking diaphragm.
Fix it. Bad brakes can get you into a worls of trouble.
Unlike the old days. My fiorst cars had little or no brakes!! I was a very good defensive driver.
Carl
1. The diaphram can leak and as such no assistance in applying pressure to the master cylinder. Hard pedal, lots of push to get any stopping power.
2. Failec vacumn supply. Not connected. Hose leaks. One way valve stuck in closed position, and as such no manifold vacuum available to aid.
3. Have you vbeen losig brake fluid with no outward signs. If so, it may be drawn iontot he engone and burned via a leking diaphragm.
Fix it. Bad brakes can get you into a worls of trouble.
Unlike the old days. My fiorst cars had little or no brakes!! I was a very good defensive driver.
Carl
#4
Join Date: Mar 2014
Location: Tehama County, California, USA
Posts: 25,185
Received 8,950 Likes
on
5,295 Posts
#5
OK, the booster may be shot, but a car this old indicates to me that a full brakes overhaul is needed. The car is 33 years old and nothing lasts forever. The rear brakes are the ones most likely to need attention as they tend to be neglected. You can sort out the handbrake whilst you're in there, too !
#6
#7
car pulling to one side suggests seized caliper/s, as mentioned above a full caliper overhaul- ie seals and clean pistons[or replace if they are rusted]
on my 86 i got away with seals/rotors/pads and piston clean on the fronts but the rears were totally rooted and required new pistons and rotors/pads as well as hand brake pads, i got the seals and pistons from British parts UK and the rotors locally on ebay.au
Richard
Trending Topics
#8
The other thing to check is whether the pump runs. Pump the pedal many times with the ignition off. Switch the ignition on, but don't start the engine, you should be able to hear the pump running continuously.
If it doesn't run check the fuses, relays and connectors. On my Saab it was the connector on the brake sensor which had corroded away.
If it doesn't run check the fuses, relays and connectors. On my Saab it was the connector on the brake sensor which had corroded away.
#9
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 6,796
Received 2,399 Likes
on
1,880 Posts
Anjum:
What pump???
Hawaii:
I wouldn't mess with a caliper rebuild. Very likely that the bores are pitted and therefore, the new seals won't seal.
Get a set of loaded rebuilds from a reputable source.
and, as a preemptive if not current hit, new front hoses as well. Dettiorated hases can cause a "pull".
Brakes are so important, the right way is the only way.
Carl
What pump???
Hawaii:
I wouldn't mess with a caliper rebuild. Very likely that the bores are pitted and therefore, the new seals won't seal.
Get a set of loaded rebuilds from a reputable source.
and, as a preemptive if not current hit, new front hoses as well. Dettiorated hases can cause a "pull".
Brakes are so important, the right way is the only way.
Carl
#10
My bad, When the op said accumulator I incorrectly assumed he had the later system.
I.e 1989-94 Jaguar XJ6 ABS Anti Lock Brake Pump Accumulator Pressure Switch | eBay.
I.e 1989-94 Jaguar XJ6 ABS Anti Lock Brake Pump Accumulator Pressure Switch | eBay.
Thread
Thread Starter
Forum
Replies
Last Post
xjrjag
X-Type ( X400 )
4
09-24-2015 10:08 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)