Rear master cylinder problems spada nt |
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danmiluk
Falcone Joined: 30 Aug 2016 Location: scotland Status: Offline Points: 66 |
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Posted: 15 Jul 2018 at 21:56 |
My rear brake which are linked to the front are terrible. I've tried bleeding them which has not made any difference pads are fine and the pistons are moving freely when the the calipers are off. I was wondering if the master cylinder could be on the way out. I've had this off a stripped to clean it out, put it back together, there seems to be a lot of movement of the piston before any pressure is building looking for thoughts on this rebuild kit or new m/cylinder
Cheers Danny
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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If you mean the pedal movement seems excessive and spongy, it is likely that there might still be some air in the system. They can be difficult to bleed properly. You are not the first to have this problem, and in some cases it is due to a worn master cylinder.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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danmiluk
Falcone Joined: 30 Aug 2016 Location: scotland Status: Offline Points: 66 |
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I going to have another crack at bleeding them does anyone know the correct sequence in which to bleed them?
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theoneandonly
Senior Member Joined: 24 Jul 2014 Location: london Status: Offline Points: 661 |
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rubber hoses ? clamp off front , bleed back , then clamp off back bleed front .
have front by h/bar when you bleed . redo once more to be sure. what brand of pads ? new pads will be soft.
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Can we assume it basically works, just long travel of the pedal? Real master cylinder problems tend to make it impossible to get any pressure at all or bleed properly.
I've probably said this a zillion times but mustn't forget every time caliper pistons are disturbed and especially if new pads put in as well, will take some time with use for them to bed in again until then the pedal / lever will always seem to be soft with too much travel. Don't forget also Spada has a proportioning valve which uses a bit of pedal travel too. Also the OEM Brembo pads were never very good, I eventually changed to Ferodo, was quite a revelation how different. Before I was chucking Brembo pads barely half worn yet because they'd "gone off". HTH |
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"Chicken nuggets don't dance on a Tuesday."
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TonyF
Falcone Joined: 29 Apr 2016 Location: New Zealand Status: Offline Points: 17 |
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Hi
It can be difficult to get all the air out of the lines for the linked brake. Have you tried using a vacuum bleeder? Start with the bleed valve on the proportioning valve. Is the piston in the proportioning valve moving freely? |
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Tony
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danmiluk
Falcone Joined: 30 Aug 2016 Location: scotland Status: Offline Points: 66 |
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Vacuum bleed kit did the job although didn't realise how little brake fluid is used in the rear braking system. Thanks for all your advice.
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