XJ40 Brakes

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KJHurlock
Posts: 5
Joined: Mon Nov 19, 2007 10:21 pm
Location: North Wales

XJ40 Brakes

Postby KJHurlock » Thu Jan 11, 2018 9:20 pm

After 190,000 miles of trouble free motoring, yesterday the brake warning light came on under braking. I have taken all wheels off, all pads in good condition (just six months old), none have low wear warning sensors. ABS sensors appears in good order with no faults. Brake fluid is at correct level with no leaks apparent, brake pedal is firm and positive. Emergency brake tests from varying speeds all perform correctly, apart from the warning light coming on each time the brake pedal is pressed.
Am I missing something? Any thoughts?

PeterDavisX300

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Posts: 230
Joined: Wed Aug 19, 2015 10:17 am

Re: XJ40 Brakes

Postby PeterDavisX300 » Thu Jan 11, 2018 10:57 pm

1995 X300

KJHurlock
Posts: 5
Joined: Mon Nov 19, 2007 10:21 pm
Location: North Wales

Re: XJ40 Brakes

Postby KJHurlock » Sat Jan 13, 2018 2:45 pm

Thank you Peter,
The Teves accumulator was at fault. The AC Delco part No. 25528382 has been discontinued but JLM 1907 is a replacement supplied by both Barratts and Dave Manners @ £220.12 inc VAT.

Thanks
Keith

PeterDavisX300

Member
Posts: 230
Joined: Wed Aug 19, 2015 10:17 am

Re: XJ40 Brakes

Postby PeterDavisX300 » Sun Jan 14, 2018 5:29 pm

That's a 'Yank' manufactured part. I'd be tempted to go on-line and look at how much it would be for a Pontiac/Buick one, it's exactly the same, and probably less than half of £200. Fed-Ex would bring that across for about £20. I think Saab use that unit as well? Saab was using those when they were part of GM. Anyway, if you've got one coming from DMG you won't go wrong. By the way, make sure a new 'O' ring is supplied!

Peter
1995 X300

KJHurlock
Posts: 5
Joined: Mon Nov 19, 2007 10:21 pm
Location: North Wales

Re: XJ40 Brakes

Postby KJHurlock » Mon Jan 15, 2018 2:06 pm

I'll let you know when the part arrives
Thanks

naki
Posts: 392
Joined: Thu Aug 30, 2012 12:28 pm
Location: Kirton, nr Boston, Lincs, UK.

Re: XJ40 Brakes

Postby naki » Fri Jan 19, 2018 1:47 am

Or try a used one?
Note the 86-89 models (Girling brakes) use a different accumulator than the 90-94 models (Teves brakes).
91 4.0 XJ6 Manual
92 4.0 XJR Manual
93 3.2S-4.0S Man conv
93 4.0 Sov
93 6.0 XJ81 DD6
93 6.0 XJ81 XJ12
94 4.0 XJR
96 X306 4.0 XJR
96 X300 Daimler Six LWB
97 X300 Sport 4.0 Manual
00 LR Discovery 2 TD5 ES A
03 X350 4.2 XJR
BREAKING various X300/ XJ40/ X308

KJHurlock
Posts: 5
Joined: Mon Nov 19, 2007 10:21 pm
Location: North Wales

Re: XJ40 Brakes

Postby KJHurlock » Fri Feb 02, 2018 5:46 pm

After testing the Teves Accumulator by depressurising the system and only getting 4/5 pedal presses, I ordered up a new accumulator. Upon fitting the new item, reconnected the battery and switched on the ignition and the pump started and after 30 seconds cut out - pressed the brake pedal and the warning light came on!! So I checked the accumulator by depressurising the system again - 20 pedal presses! so I repeated the process. The pump took 33 seconds to recharge, press the brake and the light comes on. Ignition off, depressurise again 21 pedal presses and again 33 secs to recharge. Took the car for a run - no change. Rechecked the fluid levels - okay. With the ignition on it takes 5/6 brake applications to switch on the pump and runs for 2/3 seconds before cutting off. Leaving the car for 2 hrs the pump does not fire up when the ignition is switched on and will not until the brake has been used. So now I presume that the system pressure is okay and it is a faulty pressure switch, That is unless anyone knows better and if you do please let me know.
Incidentally the old accumulator still appears to have some charge as the diaphragm is hard up against the oil connector and is solid.

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poprivet

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Location: Hampshire

Re: XJ40 Brakes

Postby poprivet » Fri Feb 02, 2018 9:01 pm

Are both rear brake light bulbs working ok?
Sounds strange, but I think some Teeves systems report a blown bulb this way.

Edit: Also possible handbrake switch needing adjustment?
1988 3.6 XJ-S coupe
'Remember that the value of your investment can plummet as well as fall'

KJHurlock
Posts: 5
Joined: Mon Nov 19, 2007 10:21 pm
Location: North Wales

Re: XJ40 Brakes

Postby KJHurlock » Sun Feb 04, 2018 11:24 am

Thanks Poprivet,
That's curious because since the Teves problem appeared I have become aware that the bonnet lights were on and I thought that I had inadvertently switched on the lights, I had not, but the side lights were on front and rear. When closing the bonnet the lights go out!
On top of that the last few trips out I've had a bulb failure warning light coming on and going out on in random manner, checked every lamp even the interior lights but they are all working. So this is even more perplexing. I'll check the hand brake adjustment and see if that's the problem.
Cheers, Watch this space!


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