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ZZZEDS
Member Since: 04 Feb 2022
Location: Wrexham
Posts: 4
  
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| Brake Pedal Soft after Front Disc and Pad change. |
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Hi ,
Ive just changed the Front Discs and Pads on my LR4. All good however the pedal goes from firm to soft. I can pump the pedal until firm, then it will suddenly go soft. Is there a bedding in procedure I'm missing ?
Any help would be greatly appreciated.
Thanks
Ian
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 4th Feb 2022 6:42 pm |
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KevinD3
Member Since: 05 Aug 2020
Location: Sutton Coldfield
Posts: 1277
  
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Sounds like they didn’t bleed them correctly. Shouldn’t have needed to disconnect the brake pipes for disks and pads but if they did they should have bled them. 2008 HSE Stornoway Grey
My Wife thinks the D3 is a hobby, The D3 thinks the wife is 💕
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| 4th Feb 2022 7:52 pm |
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ZZZEDS
Member Since: 04 Feb 2022
Location: Wrexham
Posts: 4
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Hi thanks for the reply . I changed them myself , no brake pipes disconnected that’s why I’m confused . Like you say . I didn’t realise you need to bleed them if no brake pipes were disconnected .
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| 4th Feb 2022 7:58 pm |
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KevinD3
Member Since: 05 Aug 2020
Location: Sutton Coldfield
Posts: 1277
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Shouldn’t need to as your not relaxing any pressure. What are the brake lines looking like? Maybe a s,all plot that opened when you moved and hung the callipers? Maybe just some movement in the connection that let a bit of air in. 2008 HSE Stornoway Grey
My Wife thinks the D3 is a hobby, The D3 thinks the wife is 💕
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| 4th Feb 2022 8:13 pm |
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Yankee_Rover
Member Since: 02 Jun 2021
Location: Seattle
Posts: 183
  
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How worn were your old pads/how much did you have to compress the caliper? It’s uncommon, but does happen, that seals in the master cylinder can be blown when compressing the caliper for new pads. Chances of this happening are higher if the brake pads are heavily worn and the master cylinder was operating at a different stroke for a long period of time.
A procedure to prevent this is to open the bleed screw before compressing the caliper. Of course, then you have to bleed the system. Skipping this step is a risk, but most of us take it. I always make sure to open the brake reservoir cap and compress the caliper slowly, but it’s a bit of a half measure. 2008 LR3 HSE, 4.4L V8
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| 4th Feb 2022 8:22 pm |
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ZZZEDS
Member Since: 04 Feb 2022
Location: Wrexham
Posts: 4
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Hi thanks for the reply. Yes the pads were badly worn. I removed the brake fluid resovoir cap prior to compressing the cylinder slowly back . Sounds like I need to bleed them .
I hung the calipers up with cable ties . No tension on tubes etc. first time I’ve changed them on Landrover , thought I was missing a trick 😀
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| 4th Feb 2022 8:30 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
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Check sliders not seized, then move onto checking piston/s not seizing, will need wheel off and a helper to pedal push, basically pump pedal until firm then release the pedal and carefully watch the caliper, does it move back a knatts cock or keep moving back ie the piston/s keep retracting?
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| 4th Feb 2022 8:47 pm |
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ZZZEDS
Member Since: 04 Feb 2022
Location: Wrexham
Posts: 4
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Cheers for that . I’ll give it a go in the morning . Thanks for the tips 👍🏻
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| 4th Feb 2022 8:54 pm |
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