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Old 12-19-2010, 09:12 PM   #1 (permalink)
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Default Brake fade?

Hey everyone,
Quick run down of my previous problems leading up to the last week..

00 Disco II 149k miles.
A couple of months ago I had the rear passenger hard line break/rust through along the frame under the drivers side rear passenger door. No brakes!
Had it towed to my local LR dealer, they repaired the line. Brakes seemed soft when leaving the dealer. Returned and informed the service manager that they were now softer than they had ever been. Tech takes the disco, comes back and gives the default "they're good for a disco". I explain that they were much firmer before the rupture. They re-bleed the system and send me on my way. Still too soft. I ask for another re-bleed, they take the disco back and bring it back feeling the same. Service manager assured me that they used "testbook"?? to bleed the system, blah blah blah.

I'm not a mechanic by any means, but PT was kind enough to talk me through bleeding the system myself, and I've had a great, firm pedal until last week.

We had some freezing rain one day that gave the abs and TC a really good work out. That day however, the brakes started acting up. It stops without a problem, but while sitting, the pedal fades down. I can pump the brakes and the pedal still fades. I've crawled underneath it and see no leaks, and the master is full.

Any ideas? This just started after the freezing rain caused the abs and tc to kick in, it's been fine since the dealer repair (and me bleeding the brakes) a couple of months ago.

Happy Holidays
James
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Old 12-20-2010, 05:33 AM   #2 (permalink)
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Master cylinder is most likely by-passing and will need to be replaced. Don't have the dealer do, we can walk you thru it.
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Old 12-20-2010, 06:27 AM   #3 (permalink)
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Is it possible that there was air in the abs pump that got pumped out into the system during the ice driving, or is fading only caused by a bypass leak?
I ask, because back when the line broke, the resevroir was empty by the time I got it stopped and off the road.
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Old 12-20-2010, 06:44 AM   #4 (permalink)
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No, air in the module won't cause a problem at a stand still.
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Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.

To DOWNLOAD the RAVE Manual, follow this link http://www.landroverresource.com/

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm


Need Parts?
paulgrant@mac.com or call 203-770-1699
willtillery@roverguy.com or call 434-251-9331
P.T. Schram 260-804-0458

Lucky8, http://lucky8llc.com/
British Parts of Utah, http://www.bputah.com/
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Old 12-20-2010, 07:32 AM   #5 (permalink)
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Thanks Mike,
One more question...
If there was air trapped in the pump, that was then pumped out into the brake lines when the abs activated for the first time since the repair was made, air would then be in the lines. Can air cause fade or just the spongy feeling?
I'm all for replacing the master cylinder if that's what it needs, but just want to be sure if it needs it, or just a good re-bleed.
I'm going for differential diagnosis here. Seems like there is a correlation between the fade and the pump activating for the first time.
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Old 01-04-2011, 05:33 AM   #6 (permalink)
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Default Fixed?

Did you ever find a resolution for your fading brake issue?
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Old 01-04-2011, 06:10 AM   #7 (permalink)
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Default Wow, Same issues here!

Hi,

I had bought my (6 Disco 1 a year ago and did the brakes all round, (sandblast and paint calipers with new pistons and seals, new lines, rotors) Brake system was empty for a few months.

They were good at first, then one day I ran the resevoir dry cause of a loose bleeder screw. now they are just spongie, it sucks. Bled them several times with no air coming out, still spongy. I may try the Master cyl.

Rob
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Old 01-04-2011, 06:38 AM   #8 (permalink)
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How exactly did you bleed them and how much DOT 4 did you use?
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Mike

Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.

To DOWNLOAD the RAVE Manual, follow this link http://www.landroverresource.com/

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm


Need Parts?
paulgrant@mac.com or call 203-770-1699
willtillery@roverguy.com or call 434-251-9331
P.T. Schram 260-804-0458

Lucky8, http://lucky8llc.com/
British Parts of Utah, http://www.bputah.com/
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