Randy_Baton Posted May 2, 2017 Share Posted May 2, 2017 (edited) My ESP, TCS and ABS lights are coming on and staying on. Re-starting the car turns them off but they come on again shortly Found this thread with pretty much the same problem. http://www.350z-uk.c...-esp-lights-on/ Only difference is when I turn the car on I can feel a tap through the brake pedal. Would this be caused by low brake fluid? It is due a brake fluid change anyway. I did a reasonably heavy break from ~20mph on an empty road and the brakes felt fine. My cars parked 5 minutes away and its raining, so I'm trying to trouble shoot now and then I'll check the level next I'm out there. Is this correct for brake fluids? Dot 3 or above but Motul RBF 600/660 is recommended and I need 2 liters for a flush and refill Do i need a flush? thanks Edited May 2, 2017 by Randy_Baton Quote Link to comment Share on other sites More sharing options...
Richf Posted May 2, 2017 Share Posted May 2, 2017 Yes low brake fluid can cause this issue but there is not need to flush brake fluid simply replace old with new Quote Link to comment Share on other sites More sharing options...
HEADPHONES Posted May 2, 2017 Share Posted May 2, 2017 This helped me in the original post you linked to. Although a little clean and reattaching sorted my problem initially, the old switch failed a year or two later and I put the new one in. But definitely try the fluid levels first Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted May 2, 2017 Author Share Posted May 2, 2017 Cheers, at least they are both easy things to check. Don't think its my switch due to the tap I'm getting from the brake pedal. Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted May 2, 2017 Author Share Posted May 2, 2017 (edited) How much fluid do I need if I'm just replacing not flushing? Found the answer 1 liter... Edited May 2, 2017 by Randy_Baton Quote Link to comment Share on other sites More sharing options...
Elveden 1 Posted May 3, 2017 Share Posted May 3, 2017 The "tap" at the pedal sounds as if the ABS is working constantly, you may want to try cleaning the ABS sensors as I believe they influence the EPS as well. An OBD 2 code would be helpful in isolating the problem. Quote Link to comment Share on other sites More sharing options...
Richf Posted May 3, 2017 Share Posted May 3, 2017 Have you actually checked the brake fluid level yet ? Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted May 3, 2017 Author Share Posted May 3, 2017 No, I can't park by my house and i don't drive daily. I've ordered the brake fluid as it needs to be changed anyway, so will check it out at the weekend if I don't get round to it after work. The "tap" at the pedal sounds as if the ABS is working constantly, you may want to try cleaning the ABS sensors as I believe they influence the EPS as well. An OBD 2 code would be helpful in isolating the problem. The tap only happens when I turn the engine on and got less sever the closer to home i got. I turned the car off and on at each set of traffic lights. My thinking is that as the brake fluid gets warmer it takes it more volume, so low fluid becomes less of an issue. I'll be getting a OB2 code when I'm next at the car. Quote Link to comment Share on other sites More sharing options...
Elveden 1 Posted May 3, 2017 Share Posted May 3, 2017 If the fluid was that low wouldn't the level indicator light be on ? I am new to the 350z but my earlier post was based on my Jaguar XK8 problem so may differ on these cars. Quote Link to comment Share on other sites More sharing options...
Richf Posted May 3, 2017 Share Posted May 3, 2017 If the fluid was that low wouldn't the level indicator light be on ? I am new to the 350z but my earlier post was based on my Jaguar XK8 problem so may differ on these cars. the lfuid level doesnt need to be low to cause this fault , a little below the max line can cause it Quote Link to comment Share on other sites More sharing options...
mr v6 Posted May 3, 2017 Share Posted May 3, 2017 Does the driveshafts on the Z have ABS / reluctor rings on them, or is it built into the hub / bearing assembly? From past experience a 'bumping' pedal is usually an obstruction in the air gap of one of the sensors. Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted May 3, 2017 Author Share Posted May 3, 2017 (edited) So I couldn't resist. No Odb2 codes Brake lights work but.... If I just top this up with the dot 4 I've got coming tomorrow would that be an issue? No idea whats in there at the moment, but presumed as its such a small amount it would be an issue. I'll be booking it in for a full change ASAP, but imagine it'll probably be done next week some time. Also, whats that smaller bottle to the top of the image? Its on max, possibly even slightly over. Edited May 3, 2017 by Randy_Baton Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 3, 2017 Share Posted May 3, 2017 Your Dot 4 will be fine for top up and will probably fix your issue. The other reservoir is your clutch. Quote Link to comment Share on other sites More sharing options...
Elveden 1 Posted May 3, 2017 Share Posted May 3, 2017 If the fluid was that low wouldn't the level indicator light be on ? I am new to the 350z but my earlier post was based on my Jaguar XK8 problem so may differ on these cars. the lfuid level doesnt need to be low to cause this fault , a little below the max line can cause it Thanks for that, worth remembering , rather defeats the object of a warning light if the system is that sensitive though. Quote Link to comment Share on other sites More sharing options...
Ekona Posted May 4, 2017 Share Posted May 4, 2017 I dunno, given how critical the brakes are I'd rather a more sensitive system there than anywhere else. Quote Link to comment Share on other sites More sharing options...
Elveden 1 Posted May 4, 2017 Share Posted May 4, 2017 Yes of course that's true, run out of fuel you stop, run out of brake fluid you don't. I think I was wondering why such a small drop in the level should affect the ABS/EPS in such a way as to put the warning lights on for their systems but not the level it self, after all hydraulic brakes are a sealed system so unless there is the danger of allowing air into it by allowing the fluid to get dangerously low, and I am sure there must be a safety margin built into the level indicator, it's a bit of a sledge hammer to crack a nut. Although I suppose hard cornering could allow this to happen as the fluid moved about. Just a thought no scientific or special knowledge implied. Clive Quote Link to comment Share on other sites More sharing options...
Randy_Baton Posted May 13, 2017 Author Share Posted May 13, 2017 (edited) Brake fluid is topped up, brakes lights are working, no ob2 codes. What next? The fault lights only kick in medium breaking but once on they stay on. Th fault will trigger from stationary, there doesn't have to be a load on the brakes What would be causing the brake pedal to knock when I start the engine? If there was air in system would this cause it, the fluid should have been changed in October. ****Edit**** Scrap that its the brake lights, looks to be intermittent. Would that be causing the pedal knock though? Edited May 13, 2017 by Randy_Baton Quote Link to comment Share on other sites More sharing options...
mr v6 Posted May 13, 2017 Share Posted May 13, 2017 What code reader have you used? Most cheapo ones will only read engine codes, not ABS, SRS, ESP etc. If it is the low level, although halfway I wouldn't say was low, more than likely your pads are wearing which means the pistons will move out & calipers fill up with more fluid = lower level. Faulty ABS ring / pick up, dirty sensor. Quote Link to comment Share on other sites More sharing options...
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