jaysc20xe
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Registered: 5th Feb 08
Location: cleck/leeds
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hi. ive jus put 288mm brakes and calipers onto a 1.4 8v corsa and they wont bleed properly. ive bled all the brakes until there is no air at all. when i changed them on my 16v corsa they worked straight away. i once heard off someone that when your changin the brakes on an 8v that you had to change the master cylindar aswel because the one on the 8v isn't as big as the one on 16v. the car also has ABS if that makes any difference at all.
cheers
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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quote:
Originally posted by jaysc20xe
hi. ive jus put 288mm brakes and calipers onto a 1.4 8v corsa and they wont bleed properly. ive bled all the brakes until there is no air at all.
They won't bleed properly yet you managed to bleed them? 
What exactly's wrong with them?
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jaysc20xe
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Registered: 5th Feb 08
Location: cleck/leeds
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well they will all bleed but as soon as i put my foot on peddle it goes straight to the floor.
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Ste
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Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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Did you bleed them properly or use the pedal to bleed them?
It is common knowledge that you should never pump the pedal when bleeding your brakes. It fucks the seals in the master cylinder. It sounds like you have done just that. Either get a master cylinder seal kit or replace it for one from a scrappy.
And buy an eezi-bleed kit for next time!
I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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I've used the pedal plenty of times to bleed the brakes on the corsa. As long as you're not kicking the pedal to the floor and just being a bit sensible it's fine in my experience.
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Ste
Premium Member
Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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Is that your opinion or fact? A master cylinder is not a pump. If you use it like one, then you will damage the seals. This thread is testament to that fact.
I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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Opinion, which is why I said in my experience. And despite the master cylinder not being a pump I've used it many times to bleed brakes.
As said, do it gently and it's fine.
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Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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Make sure your calipers are on the right way up!
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John
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Registered: 30th Jun 03
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I've never damaged anything using the pedal to bleed brakes, or even heard of it.
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--ToM--
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Registered: 23rd Nov 07
Location: Wirral
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aslong as you dont push the pedal to the floor when bleeding it wont damage your master cylinder also as already said check your calipers are the right way up even though they fit both sides theres is a left and a right!! iv made this mistake before!!
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smokey corsa
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Registered: 29th Sep 08
Location: leicester
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do they do the same with the engine running?
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Slammed_Corsa
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Registered: 30th Oct 05
Location: Greenock, Inverclyde
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Halfords sell a wee brake bleeding kit. Its a wee plastic bottle that goes onto the end of the brake pipe. Meant to get all the air out of the system if i remember correctly. Used one years ago on my mates nova and it worked a treat.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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quote:
Originally posted by John
I've never damaged anything using the pedal to bleed brakes, or even heard of it.
Ditto.
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Rob E
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Registered: 1st Jan 06
Location: Madeley, Stafford....I want to live back in Wales!
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Strange theroy, Ive never heard of it ruining seals by pumping the brake pedal. Inface to bleed the brakes on the Monaro's/VXR8's you have to use TECH2 and pump the pedal. Are you sure you havent got confused with pushing the caliper cylinder back in while changing brake pads?
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Ste
Premium Member
Registered: 5th Mar 03
Location: Taif, Saudi Arabia
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i may have exagerated a bit saying it was common knowledge! It was something I was told by a Girling technician a few years ago. Basically, the master cylinder seals are put under abnormal load during bleeding if you pump the pedal. It is to do with the negative pressure on the seals. It sucks the seals out of position and then you have extremely deteriorated performance from the master cylinder.
I know that a lot of people, even garages do it. But it isn't healthy for the seals.
I'm not saying it will fuck them every time, clearly it doesn't and I used to bleed brakes that way too. But when the same thing happened to me after a fluid change on my 106 I spoke to the bloke from Girling and he explained how it happens.
The recommended method for 'most' cars is the pressure method.
i.e. forcing new fluid through with an eezi-bleed or similar.
[Edited on 26-03-2009 by Ste W]
I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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3i_gaz
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Registered: 29th Nov 07
Location: Liverpool
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only ever heard of mastercylinders going fucked whilst bleeding if they are ran dry and "roll" the seals and split them.
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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Go buy a cheap pressure bleed kit.. They are only a few £'s
http://cgi.ebay.co.uk/EEZIBLEED-Complete-bleed-Kit-Low-Pressure-Bleed-Kit-MG_W0QQitemZ390039499504QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item390039499504&_trksid=p3286.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318
Does anyone know if the 16v MC is actually bigger than the 8v one?? I always thought they were the same?
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Brett
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Registered: 16th Dec 02
Location: Manchester
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quote:
Originally posted by John
I've never damaged anything using the pedal to bleed brakes
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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I've never fucked my master cylinders pumping the pedal or heard of them braking this way, but you can fuck them by pushing the calliper piston in too fast.
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DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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I've only known people to fuck them up when they press the caliper piston back in and the seals have gone inside out.
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
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quote:
Originally posted by sand-eel
I've never fucked my master cylinders pumping the pedal or heard of them braking this way, but you can fuck them by pushing the calliper piston in too fast.
braking = breaking... I got mixed up because we are talking about brakes AAAAAAHAHAHHHAHHAAHHHHHHHHHHHAA
[Edited on 27-03-2009 by sand-eel]
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jaysc20xe
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Registered: 5th Feb 08
Location: cleck/leeds
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quote:
Originally posted by smokey corsa
do they do the same with the engine running?
yea it still doe sit with engine runnin. how would ya no if the calipers were on he wrong way then. thanks everyone for the advice.
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John
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Registered: 30th Jun 03
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Bleed nipple should be at the top.
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jaysc20xe
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Registered: 5th Feb 08
Location: cleck/leeds
User status: Offline
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quote:
Originally posted by John
Bleed nipple should be at the top.
jus checked car and bleed nipple is at bottom. how come this makes a difference then.
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John
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Registered: 30th Jun 03
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Air goes to the highest point, if the bleed nipple is at the bottom the air will be sitting at the top while fluid comes out the bottom.
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