johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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Put a new rear beam on a Corsa 1.2 8v. Replaced the rear lines at the same time.
Had some brand new brake pads sitting there and the current ones were wafer thin so i replaced them, usual method, resevoir cap off and pushed pistons back by hand. They went back very very easily.
Adjusted the rear brakes up so they're nice and cosy on the drums, then bled the system with fresh dot4 fluid using pipe into a bottle method with a non return valve on the end. Did this with 3 corners, one corner i had to bleed off of the pipe as the nipple snapped 
The brake pedal is shit! loads of travel, and just about bottoms out on the floor although the car does stop and the brakes still lock up.
Have i flipped the seals in the MC pushing the pistons back?
If so, how easy is the MC to replace? Is it just a case of scuttle panel off, undo the MC bolts and brake pipes then it should pull apart from the servo which i can leave in situ?
Many thanks.
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fazza
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Registered: 7th Feb 08
Location: Plymouth
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could be that or there is air in the system somewhere
the fitting that goes to the inlet manifold on my gsi is dodgy and does this sometimes
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chris_uk
Premium Member
Registered: 8th Jul 03
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does it have ABS?
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fazza
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Registered: 7th Feb 08
Location: Plymouth
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mine does yes
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DERV-POWER
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Registered: 13th Sep 09
Location: Greenfield, Flintshire
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get one of these http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_204645_langId_-1_categoryId_255216#tab2
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davieslim
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Registered: 15th Sep 08
Location: Glasgow City
User status: Offline
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on mines when the seals turned you would press thep edal and the fluid would go down but return straight back int othe resovoir when the pedal came back up, wouldnt allow any fluid into the system and i had to buy a new one
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corsajay88
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Registered: 22nd Aug 11
Location: Upton, Cheshire
User status: Offline
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Check the metal clips on the front caliper, i put one of these back on slightly wrong and got the same symptons. Took me a couple of days to figure it out as well
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ainsley_brader
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Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
User status: Offline
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Theres air in the corner where the nipple snapped!
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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quote:
Originally posted by corsajay88
Check the metal clips on the front caliper, i put one of these back on slightly wrong and got the same symptons. Took me a couple of days to figure it out as well
Do you mean the small, wear indicator clips? if so, these don't have them.
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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quote:
Originally posted by ainsley_brader
Theres air in the corner where the nipple snapped!
I hope it's that! I took the pipe off, stuck the bleed pipe on the end and bled the system until no air. Then put the pipe into the cylinder, got the mother to work the pedal while i bled it until i was satisfied it was ok.
The car does stop and stops straight, all 4 brakes bite. just shit pedal.
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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quote:
Originally posted by davieslim
on mines when the seals turned you would press thep edal and the fluid would go down but return straight back int othe resovoir when the pedal came back up, wouldnt allow any fluid into the system and i had to buy a new one
I get fluid through the system no problem.
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corsajay88
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Registered: 22nd Aug 11
Location: Upton, Cheshire
User status: Offline
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the long ones that go on the outside of the caliper, retaining clips.
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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quote:
Originally posted by fazza
mine does yes
Bleed it with the engine running then.
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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quote:
Originally posted by corsajay88
the long ones that go on the outside of the caliper, retaining clips.
I didn't even remove these as it was getting dark and i was in a hurry. The pads went in and out no issue without removing the clips so i assume this is not the issue.
[Edited on 08-03-2012 by johnhara1]
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fazza
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Registered: 7th Feb 08
Location: Plymouth
User status: Offline
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rear master cylinder gona in the drums? think thats what mine is 
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
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Checked both rear cylinders, they're not leaking and not seized.
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FlaFFy_91
Premium Member
Registered: 30th Sep 08
Location: Formby, Merseyside
User status: Offline
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if you havnt bled the caliper on that last one that had the snapped nipple then there will more than likley be air in there causing a shite pedal
bleed them all properly or theres no point in bleeding them atall tbh mate
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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Of course i've bled the one with the snapped nipple, i just beld it using the pipe.
I dont think there's any air left in the system, that's why im concerned that my MC is buggered after changing the front pads.
It's common for the seals to flip on old corsas astras etc
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scottyp1989
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Registered: 29th Jul 07
Location: Warley, West Midlands
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if you have bled it from just the pipe then there is a high chance its not bled properly. all you have done is got rid of the air in the pipe, not the caliper.
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johnhara1
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Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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I've had it pressure bled this morning, it's all sorted now.
I was aware that bleeding from the pipe would probably be the issue but i'd bled it a few times.
Think i'd just got it into my head that i must have knacked the MC when pushing the pistons back for the pads.
I dont think i'll bleed from the pipes again, i'll just buy a new rear cylinder 
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johnhara1
Member
Registered: 19th Oct 06
Location: Newcastle upon Tyne
User status: Offline
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Scrap that, pedal fucked again.
Need a new MC.
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