Strange braking problems

darrenm · Jan 4, 2015

I have got a strange braking fault ( I have no faults listed on my hawkeye) if I brake more than once or twice I have a very hard brake I have checked for any air leaks ( and replaced the oneway valve ) I did fit a new alterntor/ vacuum pump and when I pull the oneway valve / pipe off there is a vacuum but not 100% sure how much vacuum it should have all I can think is poss brake booster gone faulty

listerdiesel · Jan 4, 2015

You have just used up the available vacuum, nothing terrible. If you have a V8 it takes longer to run the reservoir out if the engine is running. The TD5 has a vacuum pump on the back of the alternator.

Peter

darrenm · Jan 4, 2015

It should last longer than one press of the brake peddle also if you keep your foot on the brake it does hard

Orch · Jan 4, 2015

I've had the same on mine ever since I bought it, I know a couple of others that have too. First press is normal, second press if done quickly after the first is firm. Still works though so that's alright with me

darrenm · Jan 4, 2015

Mine used to be good but will have to find what's causing it

listerdiesel · Jan 4, 2015

darrenm said:
It should last longer than one press of the brake peddle also if you keep your foot on the brake it does hard

Why should it last longer? Where does it say that?

Peter

darrenm · Jan 4, 2015

It should t go hard after one press of the brake there isn't any air leaks / vacuum leaks I suspect it a faulty vac pump or even a faulty or stuck slidder

DIFFLOCK66 · Jan 6, 2015

A stuck slider is easy enough to check before looking at the vacuum pump, just the pain of removing all 4 calipers to see what's up (warm garage needed in this weather!

)

I've noticed a different phenomenon. Sometimes I get a harder braking application on the second press, but what i mean by that is when I'm slowing down on the road, off the brakes then back on & the second time is more efficient for the same effort, not loss of servo assistance. I was told that the first press seats the pads against the discs, taking up any clearance caused by vibration on the road, then the pads are right against the disc for the second press.

Orch · Jan 6, 2015

DIFFLOCK66 said:
A stuck slider is easy enough to check before looking at the vacuum pump, just the pain of removing all 4 calipers to see what's up (warm garage needed in this weather! )

I've noticed a different phenomenon. Sometimes I get a harder braking application on the second press, but what i mean by that is when I'm slowing down on the road, off the brakes then back on & the second time is more efficient for the same effort, not loss of servo assistance. I was told that the first press seats the pads against the discs, taking up any clearance caused by vibration on the road, then the pads are right against the disc for the second press.

That's probably a better explanation of my experience actually

darrenm · Jan 24, 2015

Took it for its mot and they have failed it on the brakes they have tryed to tell me the brake servo is defected so I need to find a fix i swopped the servo over for a good used on and it made no difference

Ricksailhog · Jan 25, 2015

I had the same problem,checked the disc,s and they were well worn. Changed them and pads, now brakes work 100%☺️.

darrenm · Jan 25, 2015

It's just strange that they work fine for a few times before the peddle goes hard once you have driven a short space of time they work again

darrenm · Feb 1, 2015

All sorted replaced the alternator and vac pump brakes are back to normal

Strange braking problems

darrenm

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listerdiesel

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darrenm

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Orch

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darrenm

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listerdiesel

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darrenm

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DIFFLOCK66

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Orch

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darrenm

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Ricksailhog

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darrenm

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darrenm

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