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brake pedal goes to floor--I've replaced everything!!!
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Well....just for s&g I googled WJ booster/master and came up on the deadjeep website. for $36.00 I get a 99-04 Grand Cherokee WJ Power Brake Boost Booster delivered. For $36.00!! I figured wth...so that's on the way. I'll see what I get from that.
Well....just for s&g I googled WJ booster/master and came up on the deadjeep website. for $36.00 I get a 99-04 Grand Cherokee WJ Power Brake Boost Booster delivered. For $36.00!! I figured wth...so that's on the way. I'll see what I get from that.
That's a great price. I've been wanting to upgrade my 89 MJ to a nice dual booster. I already have discs in the back from a 92 Crown Vic. I'm too lazy to google at the moment. Anyone recall what years were a straight bolt-in or minimal mods?
sorry for the huge pic But remember where I said I didn't have any leaks?? Well the sharp eyed will spot the wet brake fluid on this leaf. This is what I found this morning. It turned out the rear line on the prop valve was about half a turn loose. So fixed that and vacuum bled the rears again. Brakes are better. But the pedal still goes to the floor with a whoosh form the booster.
So I think I'm done for a bit. I'll work on it some more in the next few days. The plan is to remove the master cylinder AGAIN and extend the actuator rod as much as I can and see what that does. Then I'll bleed the brakes AGAIN and hope for the best.
Ok. So I went out yesterday and figured I’d try extending the actuator rod. I measured it at about 82mm. I was able to extend it to 100mm. But I did add a jam nut on the end to help support the extension since it was a bit wobbly. That helped a lot. Brakes are right there at the top but they feel kinda odd. Almost no progression. When the pedal is pressed the brakes are right there and pushing further doesn’t change much. It doesn’t go all the way to the floor anymore but lockup takes a hard push on the pedal. And I think my rear brakes are dragging since they were much hotter than the front after a trip around the block.
So I’m gonna pull the rod back out and run in in somewhere between the 82 and 100mm length and try again. Worst case is I get exactly what I had initially.
And after that I think I’m just gonna wait till the WJ kit gets here and see what I can do with that. This combination just does not want to work for me. At least not to my satisfaction.
Engine: 4.3L with headers and full 3" exhaust system
If I could suggest the ultimate brake bleed for non ABS. Take each caliper off, turn it upside down. Have someone pump up the brakes while you hold it. After the piston comes out, use a disc brake tool to force the piston back while upside down. All the air will be forced back through the line to the master cylinder reservoir. Remount caliper and do the other side. Repeat at the other end of Jeep. This works even when the master cylinder is not bench bled
The measurements suggested for determining the rod length are quite convoluted. I used modelers clay, just a small ball and let the rod squish it up against the piston. Cut a small piece of kitchen shrink wrap to put in the bore before the clay to help retrieve it. You can then measure the thickness of the clay. It came out the same thickness the math suggested. Hitting the clay with a shot of keyboard cleaner to freeze it helps keep its shape as you try to pull it back out of the bore. I used a hooked dental pick to get it back out.
Last edited by dmoe69; 10-29-2022 at 01:33 PM.
Reason: Left out important information
Well....just for s&g I googled WJ booster/master and came up on the deadjeep website. for $36.00 I get a 99-04 Grand Cherokee WJ Power Brake Boost Booster delivered. For $36.00!! I figured wth...so that's on the way. I'll see what I get from that.
Did you ever get the booster? I tried ordering one 3 weeks ago and never got a shipping notice. I emailed them this morning and got this reply back. I'm guessing that despite the pictures, they don't actually pull the parts until someone places an order. In which case the picture on the site is probably not the actual item you're getting. Looking at Google Maps, they're a really small outfit with maybe a dozen cars getting parted-out. I want to give them the benefit of the doubt. I would have appreciated an email that they were backlogged instead of leaving me hanging.
Hi there, I checked your order for you. Your items are still awaiting shipment at this time, while our handling time is 7-10 business days after laying off eighty percent of our company for mishandling parts we are currently running a little behind in fulfilling our orders. We are doing our best to catch up. If you are uncomfortable waiting any longer we completely understand and we will be able to cancel and process a refund for you should you request it. Let us know and our sincerest apologies for the delay.
I replied that I still want it, provided they can ship before Christmas since I was planning to install it over the holiday break.
10-28-2022, 08:24 AM
But remember where I said I didn't have any leaks?? Well the sharp eyed will spot the wet brake fluid on this leaf. This is what I found this morning. It turned out the rear line on the prop valve was about half a turn loose. So fixed that and vacuum bled the rears again. Brakes are better. But the pedal still goes to the floor with a whoosh form the booster.
