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Why do we do it



Member Since: 16 Mar 2025
Location: Oxfordshire
Posts: 17

United Kingdom 2009 Defender 90 Puma 2.4 XS CSW Aintree Green
Puma ABS purging brakes (diagnostic tool help)
Hi all, would anyone know if there’s a diagnostic tool out there that can activate and so help purge the air from the ABS system (Wabco) of a 2009 Puma. I have a gap 3 and Icar soft diagnostic unit, both of which do not have the functionality to activate the pump remotely. I’ve have a random ABS triggering issue and I wanna make sure that it’s not air in the system that might be causing the problem . I have done all the manual bleed procedures but the brake pedal still seems to gently lower when I press it. looking forward to your replies many thanks.
Post #1071776 20th Jul 2025 8:49am
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jbcollier



Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 254

Canada 2009 Defender 110 Puma 2.4 SW Alpine White
Sounds like your master cylinder is bypassing, a common, age-related failure.
Post #1071799 20th Jul 2025 2:41pm
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Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 2426

United Kingdom 
A Nanocom can do a power bleed , a modulator bleed , a front right test , front left test, rear right test and rear left test on a 2.4 with Wabco ABS.

If a member nearby has one I’m sure they can help you out
Post #1071803 20th Jul 2025 3:35pm
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Why do we do it



Member Since: 16 Mar 2025
Location: Oxfordshire
Posts: 17

United Kingdom 2009 Defender 90 Puma 2.4 XS CSW Aintree Green
Thanks for the reply’s. Ianh thanks for the info , I will try a track down a Nanocom in the RG9 area.
Jbcollier it’s Interesting what you say about the master cylinder possibly bypassing. Would this not show a fluid leak somewhere? I can’t see any staining. Do you think this possibly fault might trigger random ABS?
Thanks
Paddy.[/b]
Post #1071814 20th Jul 2025 6:10pm
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MR_JAMES



Member Since: 10 Oct 2013
Location: ESSEX
Posts: 263

United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Stornoway Grey
I was messing about today trying to power bleed mine after pads, discs and all four calipers rebuilt, didn't have much luck managed to bleed it on my own the manual way.

I have a 2011 2.4 - I don't think its a wabco, there are no labels on it but ai thinks its a bosch unit by the part numbers.
Like you I have an icarsoft lr2 and although abs power bleed is not listed under defender i was able to choose range rover and get into and access the abs that way, it went through the motions and told me to do what wheel and press the brake pedal, i thought wow! unfortunately it the pump didn't energise.
I also tried sdd and that was the same, going step by step but no abs pumping. 1953 80"
1987 mini city e
2011 90"
Post #1071841 20th Jul 2025 10:32pm
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HardCharger



Member Since: 03 Mar 2013
Location: Manila
Posts: 783

Philippines 2011 Defender 110 Puma 2.4 SW Stornoway Grey
I was just told to find a hardly used straight road / track then run to speed then slam on the brakes to get the ABS to work and purge any possible air inside Whistle

Honestly haven't tried it so not sure how effective. Mr. Green

Mind you, I was told to do it multiple times to boot! Thumbs Up No Better Friend, No Worse Enemy
Post #1071847 21st Jul 2025 4:32am
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jbcollier



Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 254

Canada 2009 Defender 110 Puma 2.4 SW Alpine White
A sinking pedal with no loss of fluid usually means the master is bypassing internally.
Post #1071952 22nd Jul 2025 4:12am
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Why do we do it



Member Since: 16 Mar 2025
Location: Oxfordshire
Posts: 17

United Kingdom 2009 Defender 90 Puma 2.4 XS CSW Aintree Green
Okay,,,thanks to all the replies. Looks like this weekend. I will be replacing the master cylinder and then probably do a manual bleed to see if there’s any improvements. Hoping this will also help with the random triggering of the ABS. Thanks again .
Post #1071959 22nd Jul 2025 7:18am
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