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Power brakes not working right.

 
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Old 06-18-2019, 08:58 PM
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Default Power brakes not working right.

Hello,

I have a 2002 X-Type 2.5. After the first or second push of the brakes they will become hard to press but still function although you may stop quicker than intended or need a little more pressure to do the job.

I had a vacuum leak on the manifold and thought it could be the culprit but I changed the upper and lower intake manifold gaskets and although my limp mode 3000 rpm limiter is a thing of the past, the brakes are still wonky.

I can only think of 2 things, a restriction in the master cylinder/ABS related issue (No ABS lights though)

Or

the vacuum booster.

But, it does not act like other vehicles with a bad booster, I do not have to stand on the brakes and I do not hear air hissing when pressing on the brakes.

I suppose it could be a small leak in a diaphragm but I am not really certain.

Has anyone else had issues like this?

Thanks
 
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Old 06-18-2019, 09:17 PM
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Check the brake booster line for leaks. SEARCH will tell and show you how.
 
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Old 06-18-2019, 09:31 PM
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Originally Posted by Dell Gailey View Post
Check the brake booster line for leaks. SEARCH will tell and show you how.

I purchased a new line for it a while back and it is good at both ends, no leaks check valve is good. I even RTV the part to the manifold to be sure. PCV valve line is in great condition, replaced IOT oil Rings, Replaced Upper and lower manifold gaskets as I was getting P0420 code. All those codes cleared up only Dirty Cat code now but, that doesn't involve vacuum so I am still kind of stumped and hate to randomly throw parts at it.
 
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Old 06-18-2019, 09:34 PM
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You have not bled the brakes, correct? Automatic or manual?

A sticking rear caliper can cause this also. As member Thermo says, take it out for a good drive. When done, get out and place palm towards each wheel (don't touch them). If one is SUBSTANTIALLY hotter than the others, that's the culprit.
 

Last edited by Dell Gailey; 06-18-2019 at 09:41 PM.
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Old 06-18-2019, 09:39 PM
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Originally Posted by Dell Gailey View Post
You have not bled the brakes, correct? Automatic or manual?

Correct, I have not, I was thinking about this also but they are not spongy more like a bottle jack that pumps easily until it hits the load. But, Jag could be a bit different from regular cars but it is the same basic systems so I am a bit stumped not having coming across it before.
 
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Old 06-18-2019, 09:40 PM
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It is an Automatic, sorry, missed that bit.
 
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Old 06-18-2019, 09:50 PM
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Just a thought on a manual they share system with the slave cylinder
 
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Old 06-18-2019, 11:59 PM
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I have been having the exact the same problem. Mine was/is a split brake booster vacuum grommet. (Rubber part that the vacuum line elbow pushes into.)
See this thread: https://www.jaguarforums.com/forum/x...5/#post2086546

My car would start out without vacuum to the brakes, then when I rev'd the engine, I would get partial brake vacuum. I moved the elbow around on the booster grommet and I would get brakes again.
The leak is close enough to the vacuum booster that the leak is drawn into the vac line and you don't get a brake error.

Perhaps you have a different problem than I did, but at least it is worth looking into.



 
 
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