|
||
|
24th February 2020, 20:28 | #21 |
Loves to post
MG ZT-T Join Date: Nov 2014
Location: Hawick
Posts: 350
Thanks: 46
Thanked 22 Times in 22 Posts
|
Each caliper corner bleeds as normal just NO pressure on pedal.
|
24th February 2020, 21:07 | #22 | |
This is my second home
MG ZT CDTi Join Date: Jan 2014
Location: carrick
Posts: 7,859
Thanks: 3,494
Thanked 2,657 Times in 1,973 Posts
|
Quote:
I cannot understand how even if a seal flips in the cylinder, there would be no movement in the pedal. Have you tried starting the engine?
__________________
It is not gloss primer .............. it is duct tape silver! |
|
24th February 2020, 21:18 | #23 |
Regular poster
Rover 75 Tourer + saloon Join Date: Apr 2019
Location: Newport
Posts: 99
Thanks: 16
Thanked 27 Times in 21 Posts
|
[QUOTE=clf;2795252
I cannot understand how even if a seal flips in the cylinder, there would be no movement in the pedal. ?[/QUOTE] My understanding of what is being reported is the pedal goes all the way to the floor with no resistance, I.e. no pressure being built up in the system when pedal pressed, so no braking. Or have I got wrong? |
24th February 2020, 21:23 | #24 |
Regular poster
Rover 75 Tourer + saloon Join Date: Apr 2019
Location: Newport
Posts: 99
Thanks: 16
Thanked 27 Times in 21 Posts
|
|
24th February 2020, 22:36 | #25 |
This is my second home
Rover 75 CDT-2001 Join Date: Jan 2009
Location: Wrexham, North Wales
Posts: 3,606
Thanks: 195
Thanked 606 Times in 501 Posts
|
It seems to me if you have no pressure at all in the pedal that we know exactly where the air is, it is in the master cylinder, right at the top of your system. It is going to take a lot of pumping and time to get it right from the top of your system to come out through a nipple at the bottom, and air likes to rise, not fall.
Are you absolutely sure the reservoir is being kept full throughout your bleed cycles? Try pressing the pedal down and keeping it down for a while, while you let some fluid flow through one of the lines, just to make sure fluid definitely flows through from reservoir to the master cylinder. You must have an airlock somehow. It did happen to mine once. You need to get fluid flowing quite quickly for it to clear so either some furious pumping ensuring the reservoir is full at all times, or check for Jules post on the reverse bleed method and inject fluid through the nipples up-hill instead. If using reverse bleeding, follow his guide to the letter not skipping any part of it. |
25th February 2020, 10:01 | #26 |
This is my second home
R75 Saloon. Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
|
From reading all of the above posts I can only conclude the master cylinder is not working. Even with a duff piston seal you WILL be able to bleed the brakes as there is no pressure involved. However under pressure the seal is not working.
With all the things you've done up to now it is very unlikely there is air in the system.---The piston seal in the master cylinder is dead.--- |
25th February 2020, 12:45 | #27 | |
This is my second home
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
Location: Hampshire
Posts: 11,550
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
|
Quote:
How clean was everything? Any bit of muck getting into the system can prevent the seals from working if you are unlucky. I'd have another go at bleeding it, as air entering the brake lines at the master cylinder will take some time to purge through. |
|
25th February 2020, 15:48 | #28 | |
Posted a thing or two
Rover 75 Saloon Join Date: Apr 2019
Location: Under the car
Posts: 1,840
Thanks: 210
Thanked 244 Times in 221 Posts
|
Quote:
|
|
27th February 2020, 21:10 | #29 | |
Loves to post
MG ZT-T Join Date: Nov 2014
Location: Hawick
Posts: 350
Thanks: 46
Thanked 22 Times in 22 Posts
|
Ok got it back on lift and spent 30+ mins back bleeding loads of air. Mickyboys master not needed so I have brakes. 2 pushes almost firm 3 and rock solid. Now I just have to get it back to the way it was and re-bleed normally to expel all air as the spongy brakes are back but at least I have them. Many thanks to ALL especially Jules who isn't in this thread but reverse bleed got the master clear enough to get operation back. Cheers, Guys. I can do the rest on the road outside the house with easy bleed until I get my brakes back to how I like them; instant response. On another not I've left messages with Brian aka MarinaBrian has he cut all ties? he's such a good guy unless someones ticked him off its not like him to not say anything? Cheers, Alan
Quote:
|
|
|
|