Car won’t move after a sudden hard stop

SchumiF399

Hi guys,

As the thread title states, my 7AT Z is having trouble rolling forward after a hard stop. I was out drying my brakes around the block after a wash to put the car into the garage. (I have to do this every time or else the Stoptech street pads will “weld” to the rotors). When the car would not move for about five seconds after hard braking and coming to a stop. I want to point out I just had the Trans fluid changed. Is this normal or is this a cause for concern? In the past I never applied the brakes until I came to a full stop, so idk if this issue just came about or I been having it.

Thanks in advance

JARblue

Weird. I've never heard of the stoptech pads doing that but that's the first place I'd look. Too easy to change out pads and see if the problem is solved.

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SchumiF399

Thanks JARblue, I am not sure it’s the brakes but I’ll have a look. I am thinking of maybe going with oem pads. These leave a pad imprint every time I wash it . I do want to state that after the car came to a stop it would not accelerate it just revved for a second or two and then got going. It felt like it was trans related but then again it might be in my head since I just got the fluid changed 2 days ago.

240se

Sounds like a possible trans fluid level issue. I have the Stoptech sport pads and they weld to the rotors after a wash if I don't dry them out.

Rusty

If I wash my Z and leave sit overnight. My Carbo's will stick to my RacingBrake rotors. Nothing serious. They will break away easy. And there is an outline of the pads on the rotors. Around the block one time and it's gone.


OP, has this happened before?

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SchumiF399

I don't know how to check it unfortunately
I'll send the shop that performed the work an email and get their thoughts too. I didn't want to bother them with my assumptions if this is normal. So I figured I ask here since this forum has always been a great source of help. Thank you.

SchumiF399

Yes, the pad sticking to the rotor issue I found out about when I bought the Akebonos to upgrade my stock calipers. They are coupled with the Z1 2-piece rotors.

The issue with the car not rolling after the hard stop is something I can't know for sure, as I just noticed it yesterday. When I bed in the brakes after the initial install I never came to a complete stop.

Yesterday is the first time I decided to stop as my phone had fallen out my shorts. That's when the car wouldn't roll forward. I was able to trigger the symptom at least 3 times.

I don't want to sound like I'm blaming the trans fluid change but like I said before the car revved freely for about a second or two then got going. It didn't feel like the time the pad got stuck to the rotor. I'm going to try it again tomorrow night when I get back from the gym to see if it acts up again.

Rusty

The only way to get the pads to stick really hard is to get the rotors glowing red hot. Coming to a stop, and keeping your foot on the brake pedal until the brakes cooled completely. You're not doing any of this.

What you are describing is a tranny issue. You're coming to a stop. Step on the gas pedal. The engine rev's up, then the tranny hooks up. and then you move.

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SchumiF399

Yes, exactly as you summarized it in the second part of your post. At least it’s how it feels to me too. I’ll still do a couple of hard stops tomorrow night and will update on the symptoms. I will definitely get a hold of the shop if it persists. Thanks for your help.

SchumiF399

OK, so it is definitely not the brakes I don’t think. I went out just now and applied the brakes in a mild and hard fashion and the car did the same thing. It stood still for a second or two then hooked up and rolled forward. I captured it on video from a decent stop. I hope the trans isn’t messed up, I was trying to prolong the life of it by getting that fluid changed

https://youtu.be/UpRGKRjNyfA

Rusty

That's tranny issue.

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SchumiF399

FML I got a hold of the shop just hoping to hear back soon.

Spooler

Sounds like the tranny is low on fluid after the fluid change.

SchumiF399

The shop that performed the work will have a look at it tomorrow morning. I called Z1 and they said the same thing as Spooler. Crossing my fingers I didn’t sustain any damage to the transmission.

Thanks everyone who has helped me on this.

Spooler

You should be fine.