To All,

SYMPTOM

1. car starts up all lights go off.

2. Start up acceleration and at @ 20mph the ABS LIGHT GOES ON…..EVERYTIME!

3. LIGHT does not come on at 10mph or idle speed driving down street.

4. Upon hard stop (30 to 40mph) sometimes brakes pull left…..Sometimes seems to work perfectly…NO PULL…..STRAIGHT STOP. DID THIS A BUNCH OF TIMES TO SEE IF I COULD DETECT ANY POTENTIAL FAILURE MODES.


I have tried reading up on this but my attention span is lacking.

I don’t get the feeling that I am in any immediate danger if I continue to drive….I really slammed the brakes on hard during testing.

YOUR THOUGHTS ON POSSIBLE ISSUES ARE APPRECIATED.

Softball60/Paul

 

If you had a device that could read Jaguar ABS Codes, that would tell you exactly what is causing the light. Anything else is a shot in the dark.

Having a device that can pull Jaguar specific codes, like ABS and Transmission would probably pay for itself after one read. Apparently iCarSoft makes Jaguar specific readers that have been confirmed to pull ABS codes. I would look into one of those.

 

Thanks Vee,

I was hoping you had one of those units and may have faced a similar situation.

Hopefully someone in our forum has had to face a similar condition and will be willing to share some ideas.


Softball60/Paul

 

Without the ABS codes it's only guesswork but my first guess would be some dirt got into the valve block.
Have you bled the brakes recently?

 

The attached Teves MkIV ABS system description and troubleshooting guide should help.

 

Pete,

Thanks for the response

Several months ago I flushed out the brake fluid.

Is it possible I have some air in the system…….MAINLY IN THE LOW PRESSURE SIDE OF THE ABS MECHANISM.

Could that be why it pulls sometimes and sometimes not.

If it worth a shot do you know how to properly bleed the low side of the ABS VALVE BLOCK?

I am willing to take a shot at bleeding this of possible AIR OR CRUD?

Softball60/Paul

 

The Teves Mk IV system does not require special bleeding procedures. See the second post here for the factory instructions:
https://forums.jag-lovers.com/t/can-...-iv-abs/424001

Jon

 

jalapeño,

Thanks for the information. I will try and digest.

Basically if I want to bleed the ABS low pressure side I should try the following steps.

1. Low pressure would be the two lines coming from the brake fluid sump leading to the incoming side of the ABS OF THE ABS BLOCK LOCATED UNDER THE ABS PUMP.

2. Bleed each line separately just as you would IF YOU WERE BLEEDING FLUID at the caliper. PUMP TO HARD PEDAL..OPEN THE BRAKE LINE TUBE FITTING TILL FLUID BLEEDS OUT AND THEN TIGHTEN BACK UP BEFORE RELEASING THE BRAKE PEDAL.

3. DO THE OTHER BRAKE LINE SAME PROCEDURE.


QUESTION: Should the ignition be or the engine running or should the bleeding procedure be accomplished with ignition OFF


Thanks

Paul

 

Jal1234,

I am apologizing for the incorrect name referenced.

for some reason when I type in jal it automatically reconfigured to jalapeño.

I AM TRULY SORRY FOR THIS ERROR!!!!!

softball60/Paul

 

There isn't a low and high pressure side of the Teves IV system. You are confusing what you have with the older MkIII system, which is totally different. The instruction at the link if provided to the Jag-lovers forum provides all you need.

Jon

 

jal1234,

Thanks for the response and setting me straight.

Softball60/Paul

 

Could be a dirty ABS sensor....could be a dying ABS sensor. There are four of them, so its anyones guess which one would be the problem. They are a pain to access, and expensive to replace.

 

Paul,

Every ABS problem that I can recall reading on this forum has related to the earlier Teves system, not the Mk IV fitted on very late XJS such as yours. In general, the Mk IV system is very reliable, hence why we don't hear about any owner problems. All teh complex bleeding procedures and technical problems that you have read here relate to the earlier system.

As I recall, there was a hardware and software system that enabled the Mk IV system to be fully bled by forcing actuation of the ABS valves whilst bleeding. I don't know of anywhere in the UK that might have that setup. But because of its use in other US cars, you might find a specialist over your side that has such equipment.

I would start by trying a general flush of the fluid with new fluid and see how you get on.

Cheers

Paul

 

Thanks Vee and ptjs1,

One final question!

should the ignition switch be on or off during the caliper bleed process?

thanks

Softball60/Paul

 

My experience with the ABS light is that when it comes on after 15mph, it is a module related problem. If the light does not go out after turn on ignition then usually sensor related. Detected several times on my XJS MY95.

 

Ignition off. Read the factory bleeding instructions at the link I provided.
Jon

 

Do you have a 1995.25? A 1995 XJS has a Teves III system, which is a different system.

 

Sorry, I have a MY96, produced late 95. So a Celebration version.

 

I looked at this and am a bit confused.
The Note under General instructions says "Always bleed the caliper furthest away from the actuation unit first. On left-hand drive vehicles bleed Front Right, Front Left, Rear Right, Rear Left."
The "actuation unit" Is on the front right side of the engine bay so wouldn't the Rear Left be the furthest away? Seems backward to me.
Am I missing something?

 

Hi Softball60 (Paul)

Just to be sure that your Car is not fitted with an earlier System

Is the Reservoir Triangular or Square?



Does your Brake System look like this with the Triangular Reservoir?