As the title states guys. I'm chasing the hatred code c1286. It states my booster is bad. So I did do some test and dont think it's my booster but I've never had to deal with one going bad. So pedal pushes back at me when I hold it strong and tap the throtle to raise rpms I can feel it push back at me a small bit. I hold brake pedal and shut engine off the pedal will push me up to the top.
the pedal for me seems to be sponge and seems like it has a pretty long travel to it. It dont have that I guess new car pedal feel nice easy and touchy.
I have bleed the brakes and done rotors and pads when I did the bleed I got all the old fluid out when doing so and made sure it was fresh fluid coming out. Dot 4 by the way.
would the check valve cause this? The delear wanted 330 bucks for the hose with the valve attached. Any advice or any way to test it would be awesome. Thanks guys.

Joe

 

2003 v6 s type here, i have a spongy pedal too, and i have done everything thinking it was either badly bled, or a bad pump, but apparently this is how these brakes are.
i will install either v8 or diesel brakes soon
(diesels are heavy so they got bigger brakes)
i have a 2008 charger too and that dodge stops like its on freeky magnets. And the brakes are not bigger than the jag's, so i need that stopping power on my jaguar too

unfortunately i have no details about the codes, never happened to me.

 

04-05 diesel and 4.2 has the same brakes, different bracket for 320mm rotors. they only changed to the ATE caliper with 326 front and rear from 06 on and on

 

It's not how they should be. Yours is faulty.

 

whats the first thing you can think about?
hmm
i swapped the rotors, pads, master cyl, new fluid, all lines look good, abs module bled too...
drove several stypes same year and have the same feeling. I drove a v8 facelift one, and the brakes are better (i have prefacelift)

i think they are good, but its just me comparing my 2003 jag to a 2006-2008 cars hence the difference... maybe
many thanks

 

i have someone breaking a 2006 diesel near my location... might get lucky and get the 326 rotora then 🥰

 

Ok so I will be bleeding my brake system again and hope they get a little better. I'm also thinking maybe the check valve is a little bad but I don't know how to tell honestly. Just want a better pedal

 

Check this out:
https://www.jaguarforums.com/forum/x...travel-104658/

this explains what i feel. The long travel.
and the problem was with me comparing different braking systems.
i need to mention that my car passed braking test perfectly, and it does stop.

BUT you are getting cel codes, so you might very possibly have some issues there

 

See mine stops pretty decent too. I am used to drilled rotors and carbon pads. Even on the wife's 2018 pacifica the first thing I did was buy good set of drilled rotors and good ceramic pad to accommodate the 22 inch set reps we put on it. Now the jag stops ok but I feel like it can and should be better. Maybe the stainless hoses would be good investment to achieve what I'm after. Now I do have the dsc light on and it's saying mechanical booster failure. I'll change it if it's bad and I can do so with out removing have the engine again to wiggle it out. Anyone changed it ona. 2000 4.0? It's pretty tight.

 

May well be an air leak. Also you may have ABS codes

 

How are you bleeding the brakes? The Michael Jackson method, aka a man and a boy? That's the most common method, with a helper cycling the brake pedal while you open/close the bleeder screws.

This usually works, but not so much if any air is trapped close to the master cylinder. No matter how many times you cycle the pedal, the master cylinder piston just doesn't have the volume to force any air all the way out to the bleeders.

Instead, I HIGHLY recommend the use of a power bleeder. This is what most professionals do, and it can make a YUGE difference. I've got an older pickup (1984) with a fairly simple brake system, and it was giving me fits due to a soft pedal. I can't remember how many times I tried bleeding it. I then tried a power bleeder and it was like night and day. Here's one inexpensive version:

https://www.motiveproducts.com/colle...ropean-bleeder

I'm not sure if that is the correct version for Jaguar. They sell the same basic pressure pot with different adapters for various vehicles. Look around their website for the adapters.

This video shows how to use the power bleeder:

https://www.motiveproducts.com/pages...ctional-videos

 

Hey guys! So I wanted to update a bit on my brakes. I did not change out the booster as of yet but I did install front stainless steel brake hoses and did another pump bleed on the front. I can definitely say I gained around 3/4 to inch of pedal back. Yes it does seem like a bit of pedal to get but it's there and it's so much better. I have been getting her up to some good speeds and just stomping the crap outta the pedal to make sure she will stop in a emergency situation and let's say she stops... it's a lot firmer and not so mushy now as well. I will be replacing my booster just want to read up a little and get some time to tackle this. I really want a system error free ride ypu know, that darn dsc issue is driving me up a wall lol. It all works but it's there in my face on every dang drive. Thank you all for always helping me.

Joe

 

IIRC, pressures in excess of a certain threshold (2 BAR comes to mind) are required to open all the valves for bleeding most ABS systems; a power bleeder in needed as the "Michael Jackson system" is inadequate in this instance...

 

I just purchased the power bleeder and will bleed again. Thank you.