Brakes!!!

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Saffles
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Lid geworden op: 10 dec 2009, 13:08

Brakes!!!

Bericht door Saffles » 23 nov 2015, 02:49

Hi Guys!

Ok I've had my rear subframe and shocks off in order to remove rust, repaint and make the car good.

Now.. I've also had to disconnect the brakes as the long brake line to one of the back wheels was so corroded that it started leaking when i took the subframe off.

So.. I've made new brake lines and fitted them all etc. Today we refilled and bled the brakes.. but when we had finished and I started the engine, the brake pedal went to the floor :?

I've no idea what is causing this. Does this ABS pump have to be cycled / pumped by computer to remove air on this car? (2.5 20v volvo ph2)

I've checked the brake lines, they are not leaking and my bleed valves are all tight so I am confused. I did have to take one caliper away for repair though (valve broke) and then refit it so this is the second time it has been bled and I am wondering if there may be air trapped higher up the brake line? (The first time it took about 5 minutes to pump fluid down to the rear caliper but today I got air quite quickly).

Any ideas would be appreciated!
www.safrane.info

Email: Saffles@

2.5 20V Ph2

WillemS
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Bericht door WillemS » 23 nov 2015, 12:36

You need to follow a specific procedure !
Engine running at idle, bleeding order; left rear, front right, rear right, front left.
Take care that the reservoir keeps a good level because the ABS unit is hard to bleed.
Total contents is appr. 1 liter.SAE J1703 DOT4
succes WillemS
2.0 RTE Alize Automaat (MV931)08-1999 Ph II

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AS1 (Anne)
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Bericht door AS1 (Anne) » 23 nov 2015, 16:52

If you pumped old brake fluid out by pressing the pedal to the floor you may have killed the master brake cylinder (MBC). Dirt in the back of the MBC will damage the cups.
I've been there.

Air left in the ABS pump will give you a soft pedal but not no brake pressure at all.
R25 V6 Injection aut. LPG 1989
Clio 1.4 RN 1993

Saffles
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Bericht door Saffles » 24 nov 2015, 01:16

Hi Guys!

WillemS... my car is left hand drive - United Kingdom and I think the brake cylinder is on the other side to the european (if you sit in the car, it is on the right - or left if you stasnd at the front and look at the engine). Would that make any difference to the order?

AS1... I didn't pump it out with the pedal but the system did empty itself (broken brake lines which were removed and new ones installed a week later).

As for the ABE pump, how do I bleed that?

Also AS1... if I have killed the MBC how do I fix it? Is it a total replacement of the entire unit fixed into the dash or is it a small part that is cheap to replace? (I just through out a complete spare unit for a house move :cry: )

Thanks
www.safrane.info

Email: Saffles@

2.5 20V Ph2

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AS1 (Anne)
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Bericht door AS1 (Anne) » 24 nov 2015, 09:14

Saffles schreef:Hi Guys!

WillemS... my car is left hand drive - United Kingdom and I think the brake cylinder is on the other side to the european (if you sit in the car, it is on the right - or left if you stasnd at the front and look at the engine). Would that make any difference to the order?

AS1... I didn't pump it out with the pedal but the system did empty itself (broken brake lines which were removed and new ones installed a week later).

As for the ABE pump, how do I bleed that?

Also AS1... if I have killed the MBC how do I fix it? Is it a total replacement of the entire unit fixed into the dash or is it a small part that is cheap to replace? (I just through out a complete spare unit for a house move :cry: )

Thanks
You should start bleeding at the brake cilinder that is the furthest away from the MBC. Check this.

You very likely now have air in the ABS pump. You'll need a CLIP to activate the ABS to bleed it.

MBCs can be refurbished but it's usually not economical so I'd buy a new one.
R25 V6 Injection aut. LPG 1989
Clio 1.4 RN 1993

Saffles
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Lid geworden op: 10 dec 2009, 13:08

Bericht door Saffles » 24 nov 2015, 14:27

AS1 schreef:
Saffles schreef:Hi Guys!
MBCs can be refurbished but it's usually not economical so I'd buy a new one.
IS that the small white thing that holds the brake fluid or is it a bigger larger part under it?

Any idea of cost?
www.safrane.info

Email: Saffles@

2.5 20V Ph2

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AS1 (Anne)
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Bericht door AS1 (Anne) » 24 nov 2015, 15:55

It's the cilinder which is bolted to the brake booster.
R25 V6 Injection aut. LPG 1989
Clio 1.4 RN 1993

Saffles
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Bericht door Saffles » 24 nov 2015, 16:32

So the bit that the white fluid container is mounted on top of yes?
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2.5 20V Ph2

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AS1 (Anne)
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Bericht door AS1 (Anne) » 24 nov 2015, 17:01

Saffles schreef:So the bit that the white fluid container is mounted on top of yes?
Correct.

Master brake cylinder:
http://www.mister-auto.co.uk/en/brake-m ... _g258.html

I found a repair kit here: http://www.ebay.com/itm/Renault-Safrane ... 1206403096

So it might be economical to repair your MBC after all. But i doubt it's broken especially if you replaced your fluid regurarly.
R25 V6 Injection aut. LPG 1989
Clio 1.4 RN 1993

Saffles
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Bericht door Saffles » 24 nov 2015, 22:55

I just threw away that whole MBC assembly just a couple of weeks ago - it still had the brake pedal and all the rest attached :shock:

It's times like this I wish I had no luck... especially the bad luck!!!

Thanks for the tip, I will have a dig about.

Is there no other way to bleed the ABS pump? - eg stamping on the pedal at 30mph with the car on stands?
www.safrane.info

Email: Saffles@

2.5 20V Ph2

Saffles
Berichten: 116
Lid geworden op: 10 dec 2009, 13:08

Re: Brakes!!!

Bericht door Saffles » 03 dec 2019, 11:41

Just an update on this...

With help of a friend we bled the brakes again using one of those tools that uses air pressure from the spare tyre. We got a LOT of air back out of the car and brakes were restored again :mrgreen:

Sorry i forget to update things here...
www.safrane.info

Email: Saffles@

2.5 20V Ph2

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AS1 (Anne)
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Re:

Bericht door AS1 (Anne) » 03 dec 2019, 21:18

Nice to hear from you again!
Saffles schreef:
24 nov 2015, 22:55
Is there no other way to bleed the ABS pump? - eg stamping on the pedal at 30mph with the car on stands?
Drive the car on a gravel road and brake hard so the ABS kicks in.
This will free any air from the ABS pump.
Next you'll need to bleed the system at all wheels.
R25 V6 Injection aut. LPG 1989
Clio 1.4 RN 1993

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