Author Topic: Bled new Wilwood brakes but still spongy pedal (Read 123906 times)

jimandemma · « **Reply #140 on:** April 08, 2018, 04:19:18 PM »

I know. I'll re-adjust Tuesday when I have digital verniers to get absolute correct measurements

sirfixalot · « **Reply #141 on:** April 08, 2018, 09:09:23 PM »

Perhaps check for a buckled pad which isn't sitting flat against disk

jimandemma · « **Reply #142 on:** April 08, 2018, 09:14:49 PM »

Pads are good and parallel to the discs. Clamped the lines to the calipers and had the same problem which discounted them from the equation

BOSCHVETTE · « **Reply #143 on:** April 11, 2018, 07:14:22 AM »

Have you replaced the master cylinder its the only thing it could be. The other thing i have seen is the caliper put on upside down putting the bleed nipple facing down............ I have to ask the dumb questions IT is facing up?

77CVT · « **Reply #144 on:** April 11, 2018, 07:54:09 AM »

"Clamped the lines to the calipers and had the same problem which discounted them from the equation "

Then it is the master cylinder.

jimandemma · « **Reply #145 on:** April 11, 2018, 08:29:30 AM »

Yes, replaced the Master Cylinder with a compatible Wilwood one. Calipers are in the correct orientation.

jimandemma · « **Reply #146 on:** April 11, 2018, 10:35:02 AM »

77CVT, clamped the lines with the old master cylinder. Got a new one, same problem, ARGH!!

BOSCHVETTE · « **Reply #147 on:** April 11, 2018, 12:54:24 PM »

Try this; bleed brakes. clamp all 4 brake lines. if pedal is rock hard master is in working order. if not master is problem. if master is ok take clamp off 1 caliper at a time testing each time till you find when it goes soft. your master can also be wrong size to piston size of caliper.

bfit · « **Reply #148 on:** April 11, 2018, 01:09:15 PM »

Paul
I think he has don't all that,
something is not working correctly
and may be its the new flexible brake hoses.

Jim can you make up some blanks to block of the lines at the chassis brackets
and see if you can get a full pedal

Bfit

BOSCHVETTE · « **Reply #149 on:** April 11, 2018, 01:18:30 PM »

Thats cool but at what point then did the pedal go soft?

MY081 · « **Reply #150 on:** April 11, 2018, 03:57:43 PM »

Boshie what do you know about going soft .!!!!!!!

Vettech · « **Reply #151 on:** April 11, 2018, 04:16:40 PM »

Soft only goes with those in NURSING homes or do they now call them Senior Resort style living.

bfit · « **Reply #152 on:** April 11, 2018, 06:07:03 PM »

Quote from: MY081 on April 11, 2018, 03:57:43 PM

Boshie what do you know about going soft .!!!!!!!

''Soft''! its an age thing, its what's know a cyclic fatigue. caused by a long exposure to repetitive condition.
usually closely followed by oldtimes ( Alzheimer's )
Now
re read, so you remember what we are discussing

bfit · « **Reply #153 on:** April 11, 2018, 06:09:24 PM »

Quote from: Vettech on April 11, 2018, 04:16:40 PM

Soft only goes with those in NURSING homes or do they now call them Senior Resort style living.

I thought is was called, The waiting room.

jimandemma · « **Reply #154 on:** April 15, 2018, 06:38:33 PM »

Update on the Wilwood Brake Saga. So far I have:-

Fitted Wilwood D8-4 Front and Rear Replacement Caliper Kit, BP-10 compound "Smart Pads", Wilwood vented and cross drilled discs, Braided lines

Vacuum bled the system with a hand vacuum, but was getting air past the threads on the nipples

Pump and hold method, solid fluid from top 2 nipples with no air bubbles

Gravity bled each top nipple x8 for an hour each

Pressure bled the system with no fluid in the Pressure Bleeder tank at 12 to 15PSI

Replaced the master cylinder with a Wilwood 260-8556-BK Master Cylinder Alloy Black Anodized 1.12 in. Bore

Bench bled the master cylinder and fitted with the bleeding kit installed, Booster push rod at 1.5mm longer

Pressure bled the system, air pressure again only on the fluid in the master cylinder.

Pressure bled the system with 3 litres of fluid in the holding tank, a litre from each top nipple x8

Used an oil can and hose on the bottom nipples forcing fluid through the tops, some bubbles

Removed master cylinder, adjusted push rod to have 0.5mm clearance to piston, bench bled and refitted.

Pressure bled the system again, 0.5 litres from each top nipple, solid fluid.

Replaced the standard proportioning valve with a Proflow Disc/Disc Brass Brake Proportioning Valve

Pinned the proportioning valve piston at the switch point and pressure bled the system, solid fluid from all nipples

Put the system under 15PSI of pressure, cracked each union working from the master cylinder, proportional valve to the calipers. Little to no air.

Bled the master cylinder on the car, small amount of bubbles.

Bled the system using the pump and hold method, small amount of bubbles. At times pedal would not go to the floor when bleeding the rears unless you completely released the pedal and then started again.

*** Still a spongy pedal with engine off***

*** Pedal to an inch off the floor when the engine is running using the booster***

Vettech · « **Reply #155 on:** April 16, 2018, 01:10:56 PM »

Been watching.

This has gone from a quick Forum story to the "Never Ending Story".

I now have new found respect for you. I absolutely hate being beat by a machine.

But by this point I would have spat the dummy and burnt the car to the water line.

I suppose the only question now is - What to do next ?????...

BOSCHVETTE · « **Reply #156 on:** April 16, 2018, 01:14:05 PM »

Have you checked the seals in the calipers.

jimandemma · « **Reply #157 on:** April 16, 2018, 01:15:23 PM »

I have no idea!! I'm going to get blanks and block off the caliper lines and work from there. Thought once or twice to burn it to the ground, eh.

jimandemma · « **Reply #158 on:** April 16, 2018, 01:16:58 PM »

Seals appear to be fine in the calipers, but I could be wrong.

BOSCHVETTE · « **Reply #159 on:** April 16, 2018, 01:17:48 PM »

Just use vice grips and clamp all the lines. Take one clamp off at a time and check pedal before you take the next clamp off.