The "low brake pressure" problem is one that plagued XJ40s for years. Unlike almost every other power brake system (vacuum), XJ40 brake boosters used a hydraulic system, which also controlled the self leveling system. The system was prone to problems, leakage not being least among them. While Jaguar offered a conversion kit for the self leveling system, it never did so for the brake booster. The most common cause of failure is a leak in the brake accumulator, caused by a faulty o-ring. The issue is, while an o-ring is relatively cheap, replacing it will often not fix the problem. Often the accumulator will have to be replaced, which is (ahem) outrageously expensive. However, I have seen a vacuum brake booster conversion system in a few XJ40s. I have yet to find a kit, though I believe I have a strong lead. If you can track one down, it would doubtlessly be your best choice.
As for the air conditioner, I have very little advice to offer. I never could figure out the problems I had with mine. I've heard of bills in the thousands of dollars for these repairs. The problem is that the system is needlessly complicated, and the replacement parts can be extremely expensive. My advice to you is to live with any problems you have, unless you have a clear idea of where the problem is originating.
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Re: low brake pressure warning light
Based on personal experience (another brand/model), low brake pressure ( ! ) warning light would come on if and when: 1. The brake fluid level is low (barely reaching the level sensor), refill to specified level/capacity; 2. Worn brake pads, replace; 3. Weak pressure from ABS pump, check for leakage, replace; 4. Defective sensor/switch, replace.
Only # 1 would be relatively easy to perform. All others would perhaps require the professional services of a qualified mechanic or familiarity with automotive mechanics.
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Brake warning light: This light functions for both the parking brake and the foot brake systems.
Parking brake indicator: When the ignition key is in the ON position, the light comes on when the parking brake is applied.
Check the brake fluid level. Add
brake fluid as necessary. See .Brake fluid. in the .Maintenance and
do-it-yourself. section of this manual.
If the brake fluid level is correct, have the warning system checked by a NISSAN dealer.
Low brake fluid warning light:
When the ignition key is in the ON position, the light warns of a low
brake fluid level. If the light comes on while the engine is running
with the parking brake not applied, stop the vehicle and perform the
Low tire pressure warning light (if so equipped)
If your vehicle is equipped with a Tire Pressure Monitoring System (TPMS)
that monitors the tire pressure of all tires except the spare. The low
tire pressure warning light warns of low tire pressure or indicates that
the TPMS is not functioning properly.
I don't think that is an 'emergency brake light' but a warning light referring to the problem you are having.
If it was only a low fluid level warning, this wouldn't normally affect braking as it has so either the master cylinder has failed or the vacuum brake power booster.
Try (in a safe area) pumping you pedal and note if it rises somewhat. If it does, either master or slave cylinder has blown a seal or the seals are simply worn.
To check the brake booster, with the engine off, press on the brake pedal BEFORE starting and note whether it sinks a bit one the engine has started.
If it does, the booster is likely OK.
If neither of these tests prove useful or conclusive and the car is (carefully) drivable, go to one of the chain auto parts stores and request a free scan of your on-board computer for possible stored errors relating to the braking system.
Full instrumentation pack (four
ancillary guages plus tachometer) - with volt meter & oil
guage & water temperature guage standard in addition to
WARNING LIGHTS: High beam, rear
window demist on, turn
signal / hazard light, alternator fail, lights on, park-brake
washer fluid low, radiator coolant low, cruise control
low oil pressure.
AUDIBLE WARNING CHIMES: low
on, low alternator charge, low oil pressure, high coolant
and brake failure.
Trip Computer standard
consumption figures, distance to empty, average speed &
I found this site, no mention of the fan in a cylinder, but I'll let you figure it out. Hope this helps. http://www.trueblueford.com/ed_pages/EDfalcon_fairmont.html
hi from uk the stop/handbrake light has two warning functions it will illuminate when hand brake is applied or is left on whilst driving or not fully off position ?? the other function is it is warning you that your brake fluid in the reservoir is low/requires topping up ? if it is low ? this could be due to a fluid leak ?either from pipes or wheel cyl's/calipers ? OR ? just that as your b/pads and shoes wear lower then fluid from reservoir displaces from res to cyl's to compensate for wear so may i suggest you 1st check fluid level+top up if low? then check for leaks as above more important have your brake pads and rear shoes or pads if fitted checked for wear/safety i advise this considering age/milage? of car and if you have no record of being checked/replaced recently? if your brake pads are fitted with low pads wear indicators this will also give warning hope this helps? good luck !
well its either one of two things,either its the low tires pressure warning light,which i would set all tire pressure to correct pressure and see if it goes off,and the second is the low brake fluid light,,check the resivor and top off if needed,sometimes when the brake pads are low the resivor gets lower and sets the light,,check the front and rear pads if low replace them and then check level
low pressure in the tranny, did you check the oil level in park? if so you might have to check it in gear with someone holding it on the brakes, then re-check... hopefully it isn;t the pressure solenoid.... $$$$$$.... they can be expensive, cheers!
This sounds like the low tire pressure warning light. The tires have small sensors on the back side of each valve stem that monitor your tire pressure. I live in the northeast and when the temperature really drops I get the same light. Usually once you get rolling the friction of the tire on the road heats up the air in the tire causing it to expand to it's proper pressure. You may want to check your pressures to ensure that they are inflated properly.