Honda Civic MB6 Brake pedal 'feedback' issue. Help please!

[Burbleboy]

I have an ongoing issue regarding my brake pedal fighting back ever so slightly under consistant braking. After the 1 second of pedal feedback, the brakes are normal. I have replaced all discs, pads and brake fluid is Motul rbf600 racing dot 4. There is no ABS light on and ABS works.

Could this be the brake master cylinder at fault that's giving me slight feedback through the pedal if the seals are away?

Any help would be appreciated.

P.s someone suggested that crimp individual brake hoses to single out the problem....however, i have braided hoses all round and can't do this!

[Burbleboy]

Yes sorry, meant someone crimp the hoses one at a time rather than crimping all of them, as that would cause me to crash.

The pedal feedback was a little vague. It is like the abs kicks in for a slight second. Same feeling as abs feedback. I should have made that clearer.

All the brake fluid has been renewed last month.

• edited for spelling and punctuation corrections*

[Burbleboy]

andyiley said:

I know I am being a pedantic tw@t, but your description is less than clear to me.

Is "pedal fighting back" the same as "pedal feedback"? Because it isn't!

Does "someone suggested that crimp individual brake hoses to single out the problem" mean the same as "someone suggested that crimping brake hoses one at a time may help identify the issue"?

I may suggest reading things back to yourself before posting next time to help others if you want our help.

Aside of that when was the system last bled to FULLY replace the fluid with good clean new fluid without air in the system?

I kinda thought you were going to give me some helpful PH advice but it seems you just trolled my thread and left.

[Burbleboy]

andyiley said:

I take it that means you didn't read the final line of my post then?

I did read the final line in your post but it was covered by me saying all fluid was replaced with motul dot 4.

Replacing fluid is an easy task, there is no air in system as been all double checked at the time and always bleed twice to make sure.

[Burbleboy]

MintSprint said:

Burbleboy said:

... It is like the abs kicks in for a slight second. Same feeling as abs feedback.

Sounds like you may have a slightly warped disc to me. The 'pulsing' you're feeling at the pedal is the pad running over the high spot.

If you have sliding calipers, then a sticking caliper slider may also exhibit the same symptom.

Edited by MintSprint on Tuesday 18th November 07:58

As stated in original post mate, all discs and pads been replaced.

[Burbleboy]

Burbleboy said:

MintSprint said:

Burbleboy said:

... It is like the abs kicks in for a slight second. Same feeling as abs feedback.

Sounds like you may have a slightly warped disc to me. The 'pulsing' you're feeling at the pedal is the pad running over the high spot.

If you have sliding calipers, then a sticking caliper slider may also exhibit the same symptom.

Edited by MintSprint on Tuesday 18th November 07:58

As stated in original post mate, all discs and pads been replaced. However, I shall recheck the sliders although they were greased at time of pads and were free.

[Burbleboy]

Good info there. I will check sliders again and then see if hub is distorted in any way as the discs and fluid can be ruled out I think. Cheers

[Burbleboy]

MintSprint said:

First thing is to check the disc run-out with a dial gauge (which, in an ideal world, you should have done when fitting new discs, anyway).

I have never seen ANYONE using a dial gauge after fitting new discs, regardless if they had a problem or not!! Will take your advice though. Cheers

[Burbleboy]

None through the steering mate. Pedal only pulses under consistent braking, e.g coming to a roundabout off a dual carriageway. But it doesn't do it all the time or at low speed.

[Burbleboy]

I appreciate all your input. It has put me in the right direction for things to check. That's what I was after on PH. Constructive advice and avoid getting into petty conversations from trolls. One out of two ain't bad.

[Burbleboy]

andyiley said:

Burbleboy said:

andyiley said:

I take it that means you didn't read the final line of my post then?

I did read the final line in your post but it was covered by me saying all fluid was replaced with motul dot 4.

Replacing fluid is an easy task, there is no air in system as been all double checked at the time and always bleed twice to make sure.

Well, in that case I am truly sorry to not be able to come up with any more suggestions...... Or perhaps you would have preferred that I come up with the random useless cr@p that followed my post!

It just seemed as though you were only interested in pulling me up for my post and not really helping. When changing fluid/bleeding brakes it is common sense to make sure there is no air in the system. I would have mentioned that in my post had there been any chance of air in the system but i didn't.

I used to like browsing the Gassing Station but PH has become shockingly bad for pedantic (seems to be the favourite word on here) and unhelpful members who deem it ok to abuse and make fun of every mistake others makes. I'm just ranting as you did nothing wrong. Just seemed as if you were having a pop and then left the thread hanging as you took days to reply when others kept the help going within minutes.

Sorry if this seems harsh, just how i viewed it. Cheers

[Burbleboy]

I took it that way as well but chose not to mention it as I was glad for any info to help resolve my issue.

[Burbleboy]

That is true, the pedal only pulses for around a second but is not continual.

It is hard to describe such things in words!

The flange facing was rust/dirt free when i fitted the discs, i can only think a pothole or something has maybe bent the hub facing somehow. My suspension is quite hard (coilovers) and that could be a contributary cause to any pothole/thump on road.

I would rather no name calling and fallouts here as i appreciate everyones input in this and taking the time to help me.

I WILL post up my findings once i check the sliders again and get a guage on the hub.

[Burbleboy]

It's not the ABS kicking in as the car does not pitch nose down, tyres scrub etc. All the kickback is through the pedal and does not affect the braking like ABS kicking in normally would.

I think i will also try to disconnect the ABS and see if the kickback is still there, that way it ticks the preverbial ABS box!

Edited by Burbleboy on Wednesday 19th November 20:51

[Burbleboy]

Ok, guys in my work have laser temperature guns so will borrow that and use on way home after nightshift.

What about the brake master cylinder? Could that cause such things?

[Burbleboy]

MintSprint said:

I must admit, I haven't asked the most obvious question: does the frequency of the feedback (ie. the rate of the pulses) seem to correspond to some degree with the speed the wheels are rotating?

It doesn't do it at low speed...say 40mph and under i think. Seems to be higher speeds.

[Burbleboy]

MintSprint said:

Burbleboy said:

It doesn't do it at low speed...say 40mph and under i think. Seems to be higher speeds.

But when it does do it, is the rate of the pulsing related to the speed the wheels are rotating, do you think (ie. does it pulse faster at 80mph than at 40mph?)

Feck feck feck! Got me, no idea! I shall try on way home and then get arrested for suspected drink driving!!

[Burbleboy]

Just to add, it doesn't do it any faster or slower when it happens...same two or three pulses say.

[Burbleboy]

The pedal is clear, as I always make sure (habit) of keeping the carpet away from pedals when im on the track and general driving.

I will disconnect the rear abs sensor plug tonight, on my tea break, and give it a run. That way i can rule the ABS out hopefully!

[Burbleboy]

Right! Disconnected ABS sensor (to disable all ABS) and problem goes away. This now points to an electrical/pump problem.

This was a surprise to me as there is usually a warning light on if ABS system is faulty. I'm now thinking it could be a faulty ABS pick up ring as that could throw a reading out but not be enough to bring on a light.

Will strip down each wheel in inspect the ABS ring...which means brake discs etc off yet again! Damn damn damn

Edited by Burbleboy on Thursday 20th November 00:27