Lost bakes at Barber yesterday - questions
12-16-2019, 10:46 AM
#1
Junior Member
Thread Starter
Join Date: Dec 2017
Posts: 54
Total Cats: 1
Lost bakes at Barber yesterday - questions
I have a 2007 NC. My SS braided brake hose developed a crack at the fitting near the caliper and I lost fluid and front brakes in turn 5 at Barber. The rears slowed me down enough to stay out of the gravel pit. I assume I now have air in the ABS system. Is that a good assumption? If so, do I need to have special tools get out air? I have a Motive Power Bleeder.
I have always bled my system like any other non-ABS system, being careful to keep plenty of fluid in the master cylinder. Never had any problems. I've read threads on bleeding ABS, but none are specific to the NC system. Thanks.
I have always bled my system like any other non-ABS system, being careful to keep plenty of fluid in the master cylinder. Never had any problems. I've read threads on bleeding ABS, but none are specific to the NC system. Thanks.
Reply
0
0
12-16-2019, 01:28 PM
#2
Need to burp the ABS pump. Dealer plugs an SST in to cycle the pump. Some cars will briefly power the pump when the car is powered up. NA/NB don't. Not sure about NC. Some techs will "jump" the ABS pump to cycle it. I don't know how to do that.
We generally just drive the car down the street with some junk tires on and purposely stab the brakes to engage ABS. Do this a few times and you'll feel the pedal come up a bit. This will push any air out of the pump and out to the calipers where it can be bled. So full bleed, drive car to cycle pump and re-bleed. Ghetto technique but works every time.
We generally just drive the car down the street with some junk tires on and purposely stab the brakes to engage ABS. Do this a few times and you'll feel the pedal come up a bit. This will push any air out of the pump and out to the calipers where it can be bled. So full bleed, drive car to cycle pump and re-bleed. Ghetto technique but works every time.
__________________
Reply
2
2
12-16-2019, 11:59 PM
#4
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,202
Total Cats: 1,138
Most diagnostic tools have ABS bleeding procedures. Im referring to the $2-20k ones. I use AutoLogic and a Snap-On modus myself. Or what E said. Only problem is if you don’t trigger all the channels, they won’t activate.
Reply
0
0
12-17-2019, 11:21 AM
#7
Junior Member
Thread Starter
Join Date: Dec 2017
Posts: 54
Total Cats: 1
I was fortunate that I'd wasn't up on someone's bumper when it happened. All in all, a good result from a bad situation.
Reply
0
0
12-17-2019, 11:49 AM
#8
SST or wiring hack is more precise method but not everyone here has those kinds of service tools.
__________________
Reply
0
0
12-17-2019, 08:22 PM
#11
Elite Member
Join Date: Mar 2007
Location: Santa Clara, CA
Posts: 5,167
Total Cats: 856
NB ABS has a dance you can do to cycle it (jump a couple wires in the diag connector, hold down brake pedal while turning ignition on or something like that). It's likely the NC does too because as far as I can tell all ABS is made by Bosch, no matter what brand of car it's in. Check the FSM?
--Ian
--Ian
Reply
0
0
12-18-2019, 01:23 AM
#13
Elite Member
Join Date: Mar 2007
Location: Santa Clara, CA
Posts: 5,167
Total Cats: 856
Note that this is for NB ABS (I think both NB1 and NB2, but I have only used it on an NB2 system), not the NC one referenced originally. See post #53 in my ABS swap thread: https://www.miataturbo.net/build-thr...into-nb-73579/
--Ian
The good news, is that I figured out how to engage the ABS pump in a diagnostic procedure while sitting on the jackstands. If you look in the shop manual PDF that's linked in the sticky links section as a "1999-2001 shop manual" (it's actually a 99-00, not 2001), it calls out a few things.
So the first thing is that the diag procedure won't run if there are codes in the ABS computer. To clear them, you ground the TBS wire and turn the car on without hitting the brake pedal. Let it flash the codes at you on the ABS light, then tap the brake pedal 10 times at a rate of more than once a second. When they clear it will turn the brake light on, and you'll hear the relays in the ABS unit click. Turn it off, then turn it back on, and it shouldn't flash the ABS light at all. This is on page 04-01-4 in the shop manual above.
After that, the diag procedure will run. You keep the TBS wire grounded and key it on with your foot on the brake pedal, and it will engage the pump and cycle the solenoids for each of the three channels in turn. It's not subtle, it's really really obvious when it happens. This is on page 04-13-1.
So the first thing is that the diag procedure won't run if there are codes in the ABS computer. To clear them, you ground the TBS wire and turn the car on without hitting the brake pedal. Let it flash the codes at you on the ABS light, then tap the brake pedal 10 times at a rate of more than once a second. When they clear it will turn the brake light on, and you'll hear the relays in the ABS unit click. Turn it off, then turn it back on, and it shouldn't flash the ABS light at all. This is on page 04-01-4 in the shop manual above.
After that, the diag procedure will run. You keep the TBS wire grounded and key it on with your foot on the brake pedal, and it will engage the pump and cycle the solenoids for each of the three channels in turn. It's not subtle, it's really really obvious when it happens. This is on page 04-13-1.
Reply
2
2
Thread
Thread Starter
Forum
Replies
Last Post
Godless Commie
Suspension, Brakes, Drivetrain
8
07-02-2019 05:59 AM
AndrewG
General Miata Chat
20
11-14-2017 02:23 PM
