150 Series Hard Braking

[Slip n Away Lurker Find all posts View Profile Close Slip n Away]

Have any of you guys had any bad experiances with hard braking in an emergency situation in the 150's. I was coming over the brow of a hill with a slight left hand sweep around 80Klmh. Right in front of me, there was a truck with loader trailer coming out of a driveway on my left. I slammed the brake hard - tyres squeeled and I was heading for the left hand culvert, and it felt as if the front right was digging in and I was going to flip. So backed of the brakes straightened the vehicle and applied more brake and avoided disaster. The Prado's reaction scared me and I wonder if any of you have had similar experiances under hard braking? :shock:

[maxjj Senior Member Find all posts View Profile Close maxjj]

Re: 150 Series Hard Braking

no I don`t think I got a problem like that, I did a few really hard braking manoeuvres once I got rid of the grandcraps. Braking so much better with new tyres and ABS did come on.
Did your ABS operate, can you repeat it on a quiet safe bit of road?
If you can show it to dealer, but it definitely doesn`t sound right.

[RED T UTE Member Find all posts View Profile Close RED T UTE]

Re: 150 Series Hard Braking

Was the road cambered to the left?
If it was it just gravity.

[Riaan Lurker Find all posts View Profile Close Riaan]

Re: 150 Series Hard Braking

The exact same thing happened to me, only when I came up to a red robot too fast (between 70 and 80 km/ hour) . I hit the brakes and the car took a serious nose dive, with tyres screeching and it pulled to the left.Locking the front wheels. At first I thought it might have been some oil or loose gravel on the road surface that caused it. Once I lifted my foot of the brake,( luckily there was no traffic in front of me) the car stopped behaving funny, rolled forward and I could brake again gently. I tested my VX again on another road directly afterwards, doing the hard braking bit etc, and all seemed fine. It was scary when it happened though and could have caused a major accident.

[ozwapet2 Advanced Member Find all posts View Profile Close ozwapet2]

Re: 150 Series Hard Braking

Sounds like an issue with the Stability Control software to me - very much worth reporting to Toyota. Hopefully they'll take it seriously and investigate, given all the issues they've had lately.

[Clembo Lurker Find all posts View Profile Close Clembo]

Re: 150 Series Hard Braking

Hi,
I've got GXL so I don't think this applies to me, but reading thru the manual there is mention of a little button below the steering wheel that can be switched on and off that controls pre crash braking in equipped cars. Page 276 explains that if the car thinks there is going to be a crash it applies more brakes with the switch in the on position.

Regards
Steve

[cookymonsta Junior Member Find all posts View Profile Close cookymonsta]

Re: 150 Series Hard Braking

yeh - I've got to figure out whether it's me or the car. I've never had it happen before though. If I 'stab' the brakes quickly - not slam them on, just preparing to and washing off speed quickly - for example going to overtake a road train and then realising you are not going to make it because the bloody diesel is nowhere near as quick as your old 120 petrol - I have stabbed the brakes to reduce speed and quickly get back behind the truck. for some reason the car seems to really slam on the brakes instead of washing speed off - for a second or two. it's like it is predicting an accident or full application of brake. has scared my passengers a few times when they think they're going to launch through the window. pretty annoying when it's a harmless application turned into panic.

[Ryzz Advanced Member Find all posts View Profile Close Ryzz]

Re: 150 Series Hard Braking

yeh - I've got to figure out whether it's me or the car. I've never had it happen before though. If I 'stab' the brakes quickly - not slam them on, just preparing to and washing off speed quickly - for example going to overtake a road train and then realising you are not going to make it because the bloody diesel is nowhere near as quick as your old 120 petrol - I have stabbed the brakes to reduce speed and quickly get back behind the truck. for some reason the car seems to really slam on the brakes instead of washing speed off - for a second or two. it's like it is predicting an accident or full application of brake. has scared my passengers a few times when they think they're going to launch through the window. pretty annoying when it's a harmless application turned into panic.

Had the exact same thing happen, D4D, went to overtake and found an oncoming car, braked hard(ish) to slow down and pull back in behind the car i was overtaking...only i nearly catapulted the entire cabin out the front windscreen. It def brakes over and above what was being requested by the brake pedal.

[waltec Senior Member Find all posts View Profile Close waltec]

Re: 150 Series Hard Braking

We have a 150 at work, I was driving it late the other night, road was wet, but not raining.

I have an idiot in front of me nearly stop to turn up a no entry street, I applied the brakes hard, felt the ABS come in, I then backed of the brakes as I was stopping faster that I needed, but it felt as though the ABS continued braking hard even though I had lifted my foot off the pedel and it seemed to take a second for the ABS to realise I was no longer pushing. I then felt the brake pedel come back up to my foot.

Was the weirdest sensation I have felt, I have never had this in my 120, I have only had to brake hard once in the 150 so not sure if this is how it works or just a 1 off situation.

Matt

[maxjj Senior Member Find all posts View Profile Close maxjj]

Re: 150 Series Hard Braking

the Prado does come with EBD and BA see

link below, scroll down, little video supplied.
http://www.toyota.com.au/glossary

[Kristian Ristell Lurker Find all posts View Profile Close Kristian Ristell]

Re: 150 Series Hard Braking

Yes, this also happens to my 2010 GXL V6, when hard braking immediatly after acceleration.
Front right wheel locks up, and pulls right.
ABS seems to take too long to kick in.

[surveyor Lurker Find all posts View Profile Close surveyor]

Re: 150 Series Hard Braking

It is the Brake Assist and it is way too sensitive. As described by others, I feel as if I am going to be thrown through the windscreen. I think it reacts to how quickly you move from the accelerator to the brake, interprets it as an emergency and applies full brakes. I did 265,000 km in a Ford Territory equipped with EBA and never once experienced this sensation, but it has occurred about 4 times in the first 15,000 km in the Prado. The issue really needs to be taken up with Toyota because I actually find it quite dangerous.

[waltec Senior Member Find all posts View Profile Close waltec]

Re: 150 Series Hard Braking

It is the Brake Assist and it is way too sensitive. As described by others, I feel as if I am going to be thrown through the windscreen. I think it reacts to how quickly you move from the accelerator to the brake, interprets it as an emergency and applies full brakes. I did 265,000 km in a Ford Territory equipped with EBA and never once experienced this sensation, but it has occurred about 4 times in the first 15,000 km in the Prado. The issue really needs to be taken up with Toyota because I actually find it quite dangerous.

Territorys have EBD not EDA??? EBD is Electonic Brake Distribution equalises the braking pressure you apply across the 4 wheels to maxise braking, whereas EBA replaces the the vacuum booster with a ECU controlled electric motor and can override the pressure you apply.

Matt

[LaoK User account deleted at own request. Find all posts View Profile Close LaoK]

Re: 150 Series Hard Braking

A strange sensation is when the Radar Cruise Control starts beeping a warning of an imminent crash (run-up on a car in front) and you apply the brake pedal yourself. There is a confusing battle going on with the brake application. I have tried this and to this date I don't know who had control of the braking for a brief moment; me or the Prado's computer. I felt a hard pedal and realised that it (Prado) was doing it's thing but I wanted to do mine. Another time it started braking just as I wanted to and the car nearly stood on its nose and the JEEP driver behind nearly emptied his bowels. I expected a bit of road rage and was wondering how to explain to him that I was having a bit of a domestic with my vehicle's brake computer. Fortunately his reactions were quick and nothing untoward happened.

Another time I applied my brakes really quickly and I experienced some severe bondage. The seat belt pulled me back in the seat very quickly and didn't ease up until it was happy that all was normal. I am not complaining. Just gob-smacked at the technology.

I have had the vehicle since October 2010 and it has taken me a long time to settle in to this one. I can swap from car to car easily but I find the Prado a bit harder to get used to. All is well now and I find it addictive and am not happy driving anything else. I just love the technology so much.

[akram Lurker Find all posts View Profile Close akram]

Re: 150 Series Hard Braking

Sounds like an issue with the Stability Control software to me - very much worth reporting to Toyota. Hopefully they'll take it seriously and investigate, given all the issues they've had lately.

i totally agree.

do u remember lexus gx 460 recall in US because of the stability control software issue? (http://www.insideline.com/lexus/gx-460/ ... tware.html)

vx and kakadu have the exact same software. i had my vx stability control software updated by the local dealer.