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Old 15-08-2019, 22:29   #1
Aj82
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Weird abs sensation, need help / suggestions please

I have an evo 4 with evo 9 brembos on the front and evo 6 brembos on the rear. I have Ross sport discs on the front and god speed discs on the rear.
I also have hel braided pipes to each caliper and also running braided pipes front to rear from the abs pump and block on the bulkhead.
For some reason when I brake, once I reach slower speeds it feels like the abs is kicking in way too much and for what feels like a second at a time I have no brakes to then some braking. The pedal goes hard but feels like the car won't stop, abit worrying when approaching junctions etc.
I have bled all calipers several times, inside and out and ensured no air bubbles. All the abs rings have been cleaned and visually appear in good condition. When this happens I don't get any warning or abs lights illuminating etc. The inside of my front discs do have some corrosion on them and I'm about to replace the discs but don't think this is the cause.
Has anyone else experienced similar issues? Any ideas what else it could be that I could check when I replace the discs on the front? All pads have plenty left on them but the fronts will be replaced anyway when the discs are changed.
Is there a bleed point on the abs pump I could try?


Cheers Aj
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Old 16-08-2019, 06:42   #2
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it may be worth checking with a specialist if the ABS needs to be bled with the MUT tool, since you have replaced the lines to the unit

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Old 16-08-2019, 07:10   #3
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Might it be worth removing the fuse from the ABS and seeing how the brakes are like that. But obviously be carefully and where you try!
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Old 16-08-2019, 10:46   #4
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it may be worth checking with a specialist if the ABS needs to be bled with the MUT tool, since you have replaced the lines to the unit

Stu
Ah right, that was something I have considered but wasn't aware it would need done with a mut tool.
Now need to try and find someone who has one. No local mitsi dealer but I do have ra motorsport just up the road so hopefully they can help.

Cheers Aj
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Old 16-08-2019, 10:47   #5
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Might it be worth removing the fuse from the ABS and seeing how the brakes are like that. But obviously be carefully and where you try!
Hadn't thought of that, so will give it a try and see if I can confirm the issue is within the abs pump/unit and not elsewhere.

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Old 16-08-2019, 12:56   #6
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Ah right, that was something I have considered but wasn't aware it would need done with a mut tool.
Now need to try and find someone who has one. No local mitsi dealer but I do have ra motorsport just up the road so hopefully they can help.

Cheers Aj
Im not actually sure if it does need the MUT, though if air could have got into the abs, it would make sense, got to be worth looking into though

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Old 16-08-2019, 18:51   #7
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Definitely, will have a look into it and see if it can be electronically bled. I did bleed each caliper several times to get as much air as I could out of the system.
Just seems odd, feels like its working, can feel the abs functioning but feels like it's not allowing the pads to make contact with the discs under braking and the car won't stop, not a nice feeling when approaching a junction etc.
Can't think on what else it could be though. Will replace the discs and pads and re bleed again. Might try and get in contact with russ paton and see if he can help also.

Cheers Aj
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Old 16-08-2019, 19:01   #8
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You will have a broken/split ABS ring.
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Old 16-08-2019, 23:20   #9
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You will have a broken/split ABS ring.
The rear rings were replaced a few months back and checked the fronts and seemed fine at the time but may have cracked / split by now. Will recheck them again.

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Old 17-08-2019, 10:55   #10
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Also would this not bring the abs warning light on? Had the rears go not too long ago and could feel the abs working badly and popped the warning lights up on the dash.

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Old 17-08-2019, 13:05   #11
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Hairline crack won't throw abs light, but will give you described symptoms.
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Old 18-08-2019, 21:48   #12
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Ordered 2 new front ones just incase. When I get a chance will get the new discs and pads ordered up and fit them all at once and cross my fingers lol.
Thanks for all the suggestions and help. Will report back once replacements fitted.

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Old 19-08-2019, 22:26   #13
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Yes please report back. I have this same issue with my Evolution Wagon. It doesn't happen every time I brake but usually for a second or two before coming to a complete stop. I've replaced rear rotors & calipers, brake pads, brake lines, front wheel speed sensors, front driveshafts. I didn't realise you could replace just the ring. I can't find a part number.
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