Brake Pedal Vibration

[Jay Lurker Find all posts View Profile Close Jay]

I have a 2006 Prado 120 series - VX Grade.

I have noticed a slight vibration/shudder in the brak pedal when i brake. Is this normal?

Jay

[Guest Close Guest]

Mention it at your services and get them to check all the pads are in properly and wearing well. and that everythign is "done up".
May also be worth them running a dial meter across the spinning disc to check for a wobble in it.

Wheel balance could be another culprit, lost a weight once and it was hell when you braked at speed.
Thought I had a Tasmanian tiger or a Victorian politician under the thing!

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

I've noticed ours has a tremour go thru the pedal upon touching it. Feels like the actual pedal has slight mechanical resistance before any braking action is actually effected. The brakes themselves apply smoothly.

[brizkiwi Lurker Find all posts View Profile Close brizkiwi]

My 2004 GXL 4.0V6 started to develop a vibration under light braking, especially at about 100kmh. This started at about 35k mileage. When I took it in for the 40k service I complained about it and they tested the disc runout. To my surprise they found that all four disc were out of true, and needed skimming. This was done under warranty, and the brakes have been smooth since then

I was concerned about this having occurred as I've not ever pushed the car too hard - moderate braking - nothing too harsh. The service department said it would have resulted from motorway use, with heavy braking from high speed :? . This is nonsense in my view, especially considering that the large discs fitted to the car are designed (on the higher spec models) to handle the loads / heat imposed by the traction control system.

Anyway, I've now done 52k and the brakes are still just fine.

[Jay Lurker Find all posts View Profile Close Jay]

Thanks for the help Guys.

My Prado has done only 3500 kms at the moment. I started noticing the problem a few weeks ago. My wife was driving on the Highway and she heard "thunk" sounds from the back. She stopped the car and took a look and noticed light smoke from the rear left wheel. The service fellas from my dealer immediatly went down and took a look. They drove the vehicle back, checked the brakes but they could not find any problems. They serviced the rear brakes. They reckoned that the wife might have driven the car without fully disengaging the handbrake. Wife is absolutely sure the handbrake was fully disengaged as the warning light was out.

Anyway, i have noticed this slight tremor in pedal since then. When i mentioned this to the dealer one of the guys said it may be becuase it has ABS!!!

I will have it checked when i take it for 5000km service.

Jay.

[PradoProud Lurker Find all posts View Profile Close PradoProud]

Hot brakes

Hi All

I've done about 1500K in my Grande and at the 1000K check they tightened my handbrake. Since then twice I have noticed that the left rear wheel has become very hot (not seen any smoke like Jay's wife) but substantially hotter than other three wheels. The first time it happened I notice a fair bit of vibration and thought I had a flat but that was not the case.

The second time it happened I had driven about 50k on the freeway. I organised to take it to the dealer about 2 hours later and of course when we got there it was not hot.

They did a bunch of brake tests and found no problems. This is spookily similar to Jay's problem. Anyone else had anything like this? Any clues? I'm pretty positive I released the handbrake completly. The light certainly was not on!

Cheers...Paul

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

Have just tried to adjust my Tekonsha Prodigy brake controller on 2007 D4D and am towing a 1.6t Jayco.

Whilst brakes pull us up OK there is a definite shudder in the brake pedal .

Have tried various settings on the Tekonsha ranging from 6 to 7.5 and still the shudder.

Anyone else towing similar weight with Tekonsha Prodigy fitted , having same problem or no problems.

Any suggestions too appreciated.

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

Hmm sounds like a handbrake adjustment that is too tight.
The 80 and 100 series used to do it a well.
As the the shoes inside the disc get hot they expand and cause the shudder.
Back and re-adust the handbrake and its fixed.

Unfortunatley this type of handbrake on a heavy car does not work that well.

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

Pedro,
Does the shudder go away when the caravan is disconnected??
It could very well be the caravan brakes causing your vibration??

By adjusting the Tekonsha brake controller it should not have any effect on the Prado's brake system as it is only controlling the van brakes electrically.
That is, unless the van brakes are not working & you are applying a lot of pressure on the Prado's brake system & causing the ABS to kick in? or possibly overheating the disc,s.

Just food for thought,
Cheers,
Fazza

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

Thanks for your reply Fazza.

I have not disconnected as I am taking van for some work at caboolture (north of brisbane) tomorrow.

All I can say is that prior to connecting there was no shudder and the brakes worked smoothly.

When I apply the brakes the reading on the Tekonsha moved from .C to say 2.4 so they appear to be working.
Can anyone confirm this is the case?

Will be phoning Toyota dealer in the morning to see if they can throw any light on the matter.

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

Pedro,
What was the outcome with your brake vibration??
Did it go away after disconnecting the van??
Just out of interest,
Fazza

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

Fazza,
When I took it to Caboolture mentioned my problem to the repair people.
They had a look at the wiring and said at 4mm it might be the reason that enough power wasn't getting to trailer.
It was pointed out to me that rather than a circuit breaker being fitted to wiring a fuse had been used.
Consequence of that is that if fuse blew I had no Tekonsha braking in operation
They also said it could be that the trailer brakes might not be up to scratch.

Am getting a new axle fitted to van and on completion they are going to test the van with one of their vehicles with a Tekonsha fitted to see what happens.

In the meantime I dedided to take it to the local RACQ accredited sparkie and it turns out they do all the work for one of the local Toyota dealers.

They spotted the fuse , and mentioned they always use 6mm , though they said the 4mm would probably work.
I decided to have the whole lot rewired in 6mm and during the course of installation they found that the earth wire to the 7 pin plug had 2mm wire
, and that the fitting had been done without a Toyota Trailer Plug harness.
Scotch locks had also been used which they said were a real no no in their opinion.

Consequences could have been that with a short the "Body Control Module" would have blown and might be outside warranty through Toyota and a battle with installer.

Had the correct harness installed at a cost of $55.

Upshot is now I will go to Caboolture in a couple of weeks and with van modified will try the Tekonsha and hopefully all will be well.

The sparkie who did the latest wiring said the shudder was probably the ABS kicking in when the weight of the van , not being slowed by Tekonsha , forcing the Prado wheels to lock up .

By the way Chippy is enjoying the Gold Coast and we are going fishing tomorrow.
Report will follow.

Pedro

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

Pedro,
Good to hear it is not a Prado problem, as you explained, sounds more likely to be with the caravan.
Not a good instillation of the brake controller by your Toyota dealer. (Sounds like they need their hand smacked)

Have a good day with Chippy but keep him & his Prado away from the sand.:twisted:

Cheers,
Fazza

[borgy Member Find all posts View Profile Close borgy]

Re: Brake Pedal Vibration

I have noticed a slight vibration/shudder in the brak pedal when i brake. Is this normal?

Jay

Hi all

I had a similar type of issue with the brakes this morning when driving down a small hill at approx 50km /hr.. Pretty un-normal and disconcerting,...

They came good after a few attempts at breaking and could not see any smoke, etc...

Just had the 1st 1000km service yesterday.

Will have to keep a closer eye on this and if it occurs again seek toyota comments...

cheers
Borgy

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

Picked up the van from caboolture today and on the test run the Prodigy worked well and there was no shudder in brake, so it appears the rewiring did the trick.

However, on test drive I noticed that the air con and indicators were not working, and a warning light came on (orange under oil can bottom right).
Back to caravan repair place and van checked as ok , but unable to see if a fuse was blown, as there is no fuse shown for Indicators
Took car to Toyota (Martin Jonkers Morayfield) and they found the fuse and replaced it and reset code. Fuse is under dash to right of steering wheel and is No "IG2" I think.
They said it was probably caused by van plug being wired in such a way that was not compatible with Prado wiring.

I have a 7 pin plug and originally this also powered the fridge in the Jayco.
Recently had the wiring set up so that fridge now runs off the battery in van and this battery is charged via Anderson Plug from Prado to anderson plug on van.

Back to caravan repair shop(Caboolture Caravan Repairs), and they inserted new fuse and hey presto both car and van indicators, and car air con worked.
Toyota had told me that the problem would be that wiring was such that when I reversed fuse would blow. To be safe I did not reverse anywhere between Toyota and shop.
However, after repair shop disconnected black wire ,that originally led to fridge, from 7 pin plug and reconnected plug to van blinkers etc did not work , and the warning light came back on.
New fuse and warning light off and blickers/air con all worked and I drove back home no troubles.

The repair shop suggested I have wire to Pin 2 disconnected from socket on car to avoid further problems .

When I towed van up the only difference was the old wiring on Tekonsha , so am at a loss as to why with heavier wire problem occured, but I guess this is one of those mysteries of life.

Top marks to Caravan Repairs Caboolture and Martin Jonkers who fixed problem not caused by Toyota or repair shop free of charge.

Hope the above makes sense and I will copy post to Electrical which is the appropriate place