Author Topic: Bled new Wilwood brakes but still spongy pedal (Read 115505 times)

bfit · « **Reply #60 on:** March 13, 2018, 06:57:31 PM »

Mate I would start are the beginning again.
I know you will say it’s all be done, but it’s not working and they are a simple hydraulic system , and air is the most likely cause of a soft pedal
Try taking the bleed nipples out and grease the threads to restrict air passing through the threads when bleeding with a vacuum blender
I forgot to ask did you block the outlet ports at the master cyl, to prove the cyl is not bypassing inturnally

wabco40 · « **Reply #61 on:** March 13, 2018, 06:58:34 PM »

Normally brake fluid goes into the pressure bottle to keep the master cylinder full, however I find this to messy. I just keep the master cylinder topped up.

jimandemma · « **Reply #62 on:** March 13, 2018, 07:13:58 PM »

I'm going to get that Motive pressure bleeder. I can make one, but for the sake of $100, I'll buy it.

Bfit, didn't block the master outlet ports.

bfit · « **Reply #63 on:** March 13, 2018, 07:21:12 PM »

There is a company in WA selling the Motive , I may still have the info I’ll look

wabco40 · « **Reply #64 on:** March 13, 2018, 07:21:51 PM »

Just make sure you get the correct plate for your master cylinder.

bfit · « **Reply #65 on:** March 13, 2018, 07:23:29 PM »

https://www.gumtree.com.au/s-ad/theodore/other-parts-accessories/brake-bleeder-motive-products-power-bleeder-model-0252-new-/1177999531

wabco40 · « **Reply #66 on:** March 13, 2018, 07:30:44 PM »

That’s a good price with the aluminum top plate Bob

bfit · « **Reply #67 on:** March 13, 2018, 07:38:02 PM »

Yes for that price it won’t last , most of the scams on gumtree seem to be out of Melbourne .
Hopefully this is legit
He has other car gear for sale which is a good fell thing

jimandemma · « **Reply #68 on:** March 13, 2018, 07:42:23 PM »

Just rang and bought it. He thinks the problem is the valve as well, so I'll get both.

jimandemma · « **Reply #69 on:** March 13, 2018, 07:43:24 PM »

Thanks for that Bfit, owe you a beer or 10 one day

Vettech · « **Reply #70 on:** March 13, 2018, 07:53:53 PM »

Beers Ok, but dont offer Honey, esp from a full bottle.

bfit · « **Reply #71 on:** March 13, 2018, 08:09:24 PM »

Quote from: jimandemma on March 13, 2018, 07:43:24 PM

Thanks for that Bfit, owe you a beer or 10 one day

Mate ,looking forward to seeing you and your vett on a run soon, Peter C has one on in the near future

bfit · « **Reply #72 on:** March 13, 2018, 09:20:38 PM »

I can’t find a photo of a sectioned 75 model valve, it does appear from photos that the 75 has a proportioning spool in the rear line.
I do not see how the valve could cause the soft pedal, unless the fail section has shuttled and has trapped air in the line. If this was the case one set of calipers will not bleed any volume of oil.

If you remove the valve . I’d pull it apart to investigate how it functions.

jimandemma · « **Reply #73 on:** March 13, 2018, 10:18:08 PM »

OK, will do. Might be a while though.

wabco40 · « **Reply #74 on:** March 14, 2018, 11:50:13 AM »

Quote from: Bfit on March 13, 2018, 09:20:38 PM

I can’t find a photo of a sectioned 75 model valve, it does appear from photos that the 75 has a proportioning spool in the rear line.
I do not see how the valve could cause the soft pedal, unless the fail section has shuttled and has trapped air in the line. If this was the case one set of calipers will not bleed any volume of oil.

If you remove the valve . I’d pull it apart to investigate how it functions.

I agree Bob, if the valve has failed then the front or rear circuit should not bleed any fluid. If the switch piston has moved it should also bring up the brake warning light.

bfit · « **Reply #75 on:** March 14, 2018, 12:26:36 PM »

In the older cars pre 73, the original valve, people call a proportioning valve>
Is just a manifold with a spool to trigger the switch, in those bodies the oil will pass through, with the spool shuttled either way.
later vehicles have what looks to be a proportionating valve in rear and a metering valve in the front distribution port

jimandemma · « **Reply #76 on:** March 17, 2018, 12:37:11 PM »

OK, so I've got the pressure bleeder kit

jimandemma · « **Reply #77 on:** March 17, 2018, 12:39:50 PM »

I've pressure bled all top nipples at 12 PSI, solid fluid from all nipples front and back. Pedal the same!!!

Looking at changing the Master Cylinder as I think I have torn the seal with the pump and hold method of bleeding pushing the pedal to the floor.

wabco40 · « **Reply #78 on:** March 17, 2018, 01:18:25 PM »

Was the master cylinder new or the original?

jimandemma · « **Reply #79 on:** March 17, 2018, 01:33:50 PM »

New in 2009, 5000 miles on it since. No problems prior to the upgrade.