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help please!!!


uksniper1
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hi all,i still have the annoying brake problem on my 1989 3.9 v8 rangerover classic,,ok here goes....my brakes are usualy very good,BUT..every now an again something very odd happens,if i hit a hole in the road or large bump while braking my brake pedal vibrates like mad an i loose all brakes for a couple of seconds,then they come back again..ive changed discs,pads etc,but still does it now an again,and of course its rather scary too!!,so im looking for any ideas on what this could be,i know i had a strange problem in the winter when i went out to the rangie and all 4 brakes were locked on solid,so i undid one of the 2 bleed screws on the booster unit and they freed off again,could i have let air in or some thing causing this problem i have now?..shes done 150 k miles now,so maybe a brake fluid change may help?,or could it be the accumulator?..i just havent got a clue what to try next,an as you can imagine i want to sort it very quickly too,before the brakes go all together,so please any help,or similar experiences?..thanks loads..look forward to you replies..all the best ,wayne.

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hi guys,thanks for the replies,ok,the pedal is good,nice an high and hard,the brakes are normally great an stop you dead,fluids is ok,and discs etc,its just when i hit a deep pot hole or deep rut in the road whilst braking,then the brake pedal vibrates,and i cant stop,you can push harder on the pedal and you still are moving just more vibration and no stopping,it lasts for a couple of seconds,or sometimes you can lift off and reapply pedal and alls fine again,,its very odd...

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Still sounds just like ABS kicking in, I suppose in theory it could be triggering too early, but struggling to see how or why it might happen. Dead shock or wheel bearing maybe?

Don't take this the wrong way, but are you an 'enthusiastic' driver? :)

I normally take the pulsing pedal to mean "you're being a bit of a dick Peter, slow down!" :P

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hi,ive checked wheel bearings an all was fine,and the shocks are new procomps i fitted a while ago now,but they seem good too,lol no im not a 'enthusiastic' driver lol,it happend this morning doing around 20 mph,and i dont go over 50mph to be honest,i wouldda said it was just the abs cutting in too but,it isnt slowing down at all,it just sorta rolls on with pedal shake and no braking is happening,plus this is at low speeds and on good tarmac roads too,so realy there would be no reason for the abs to be taking over as im not heavy breaking at the time i hit the pot holes etc,,,im so stumped at the moment,dont know wot it can be...

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hi,ive checked wheel bearings an all was fine,and the shocks are new procomps i fitted a while ago now,but they seem good too,lol no im not a 'enthusiastic' driver lol,it happend this morning doing around 20 mph,and i dont go over 50mph to be honest,i wouldda said it was just the abs cutting in too but,it isnt slowing down at all,it just sorta rolls on with pedal shake and no braking is happening,plus this is at low speeds and on good tarmac roads too,so realy there would be no reason for the abs to be taking over as im not heavy breaking at the time i hit the pot holes etc,,,im so stumped at the moment,dont know wot it can be...

To rule out the ABS run with it disconnects for a while. I would have thought it was the ABS also.

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hi guys,thanks for the replies,well i checked the fuses and and relays under the passenger seat and heres what i found.... all the fuse holders were filled with grease(i mean filled lol),and one of the fuses was half way in,as the connector going into the fuse holder had popped out,so after a good degrease and clean out with a stiff paint brush i set off down our farm track(very rutted an bumpy),,i hit the brakes just as i dropped into a pot hole,and the pedal vibrated .BUT ..then the rangie stopped!!..yippeee,its worked,,i tried a few times and the alls ok,the abs shakes the pedal but she stops just fine now,,so id like to say thank you for all the replies and help guys,and i hope this helps any one in the future if they have the same problem,,all the best...wayne.

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hi guys,thanks for the replies,well i checked the fuses and and relays under the passenger seat and heres what i found.... all the fuse holders were filled with grease(i mean filled lol),and one of the fuses was half way in,as the connector going into the fuse holder had popped out,so after a good degrease and clean out with a stiff paint brush i set off down our farm track(very rutted an bumpy),,i hit the brakes just as i dropped into a pot hole,and the pedal vibrated .BUT ..then the rangie stopped!!..yippeee,its worked,,i tried a few times and the alls ok,the abs shakes the pedal but she stops just fine now,,so id like to say thank you for all the replies and help guys,and i hope this helps any one in the future if they have the same problem,,all the best...wayne.

Sniper

Are you saying that your problem was electrical?

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IIRC the grease is supposed to be there, in an effor to water proof/corrosion inhibit the terminal, which lets face it are always going to be subject to the traditional LR water ingress.

I would re-grease what you have removed, it shouldn't affect the electrical connections really.

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Sniper

Are you saying that your problem was electrical?

hi mate,yep it must have been ,as all is fine now.she stops on a penny after hitting a pot hole,instead of just sailing on with no brakes at all.. ;)

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IIRC the grease is supposed to be there, in an effor to water proof/corrosion inhibit the terminal, which lets face it are always going to be subject to the traditional LR water ingress.

I would re-grease what you have removed, it shouldn't affect the electrical connections really.

hi mate,yeah i can see why the grease may have been used originally,as ive sealed an waterproofed all the rangie myself,as i do a lot of deep river crossings in her,but i mean when some one else had greased theese holders they realy had lol..it was everywhere,the holders were full to the top,and all on the connections and even the fuses were full,i left a little in for any flooding in the cabin that may occur,but im happy with the outcome as now i get abs pedal shake if i hit pot-holes whilst breaking, but she stops now instead of brake fail.. ;)

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