Rear Brake Pads Wear Rate

Submitted: Wednesday, Aug 05, 2015 at 09:27
ThreadID: 129865 Views:2735 Replies:8 FollowUps:8
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Hi,
I am in need of new rear brake pads on my Prado after getting 40k from them. Fronts done at the same time are good.
My mechanic believes that there is a sensor picking up the fact that you are towing (extra weight?) and they adjust the brake balance accordingly.

I only use the Prado for towing; 14'van; but there is a reasonable mount of extra weight.

Anyone heard of this or do I check to see if the calipers are sticking?

bill
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Reply By: Member - shane r1 - Wednesday, Aug 05, 2015 at 09:40

Wednesday, Aug 05, 2015 at 09:40
Hi
My opinion is okay, the vehicle will adjust for weight/height , but that won't make it overuse the rear pads
Are they the same make quality front and rear?
Hope you find the cause
Cheers
AnswerID: 588869

Reply By: Bob Y. - Qld - Wednesday, Aug 05, 2015 at 09:52

Wednesday, Aug 05, 2015 at 09:52
Had accelerated wear rate on one side only, Bill, on rear. Turned out the long guide bolts were binding inside the rubber "tube".

Replaced the tube, and used different lubricant, and all good. This was on Landcruiser ute, 02 model. Imagine Prado is very similar?

Bob

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Reply By: Member - Broodie H3 - Wednesday, Aug 05, 2015 at 09:53

Wednesday, Aug 05, 2015 at 09:53
Hi Buzz,
Your mechanic is dead right towing does wear your rear pads quicker, I had the same problem on the pathfinder, and like you didn't believe the mechanic so I went through the exercise of callipers and brands of brake pads, and every one I spoke to said it was the towing and the computer adjustments for the extra weight. We tow a 22' van, and now before we go anywhere I have the rear brake pads checked just as a matter safety. your vehicle may be different, and you may have a fault in the system, and we all need good brakes, so for my money do what I did and get a second opinion, better to be safe than sorry. good luck
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Follow Up By: Member - Keith P (NSW) - Wednesday, Aug 05, 2015 at 21:09

Wednesday, Aug 05, 2015 at 21:09
My Patrol does the same thing..wholly because of towing and a bit extra gear inside. Pads last longer than that tho...usually replace whole vehicle pads together....whereas not towing ...pads on the rear last 50% longer than front.
I wouldn't worry tho ...better pads wear out faster=longer rotor life.

Cheers Keith
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Reply By: Notso - Wednesday, Aug 05, 2015 at 11:17

Wednesday, Aug 05, 2015 at 11:17
My previous vehicle, Mitsubishi Triton, did 170,000 kilometres and never had a set of pads front or rear. Towed a 2 tonne van for a good part of that.
AnswerID: 588874

Follow Up By: gbc - Thursday, Aug 06, 2015 at 08:18

Thursday, Aug 06, 2015 at 08:18
Triton had rear drums - they probably just didn't work properly
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FollowupID: 856731

Follow Up By: Notso - Thursday, Aug 06, 2015 at 09:31

Thursday, Aug 06, 2015 at 09:31
Aw, now come on, the Triton was my favourite vehicle of the 9 I have owned over 55 years of driving. They were all different brands. I found the brakes very effective during the 170,000 ks when various idiots on the road tried to terminate us, the van and the truck.

I might add the Nissan patrol I had for 190,000 ks before that also still had the original brake pads when I sold it.
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Follow Up By: gbc - Thursday, Aug 06, 2015 at 09:50

Thursday, Aug 06, 2015 at 09:50
Sorry, not being nasty. Just my history with commercials not doing the right thing. My '08 Colorado with ebd was probably my first ute that stopped somewhat well. Prior to that, just woeful. I swear my 03 hilux is still on its first set of brakes. That's because it would rather kill me than stop ;)
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Follow Up By: Notso - Thursday, Aug 06, 2015 at 09:59

Thursday, Aug 06, 2015 at 09:59
Yeah, I currently have a Mazda BT50, which I don't love, drives OK, but I just can't fall in love with it. Lord knows why they put drums on the rears in all these utes, I suppose they save a couple of dollars per wheel. But I must say the ABS on the Triton worked a treat, drums and all!

I hear that the new Ranger will have a disk rear option and I think the Navarra also offers disks.
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Follow Up By: gbc - Thursday, Aug 06, 2015 at 10:16

Thursday, Aug 06, 2015 at 10:16
That's a shame. I've got the px ranger and it is hands down the best ute Ive had. Not without its quirks (who makes 12v outlets that aren't ignition switched?), but definitely a leap in the right direction unless you are parking at a shopping centre.
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FollowupID: 856745

Reply By: Hoyks - Wednesday, Aug 05, 2015 at 22:21

Wednesday, Aug 05, 2015 at 22:21
Next to the rear diff is a brake proportioning valve. This valve is there to stop the rear wheels locking under heavy braking by reducing some of the braking force applied to the rear wheels when there is no load on and provide more rear braking when the rear suspension is compressed, as would happen if towing or carrying heavy loads.

Often times when you get a spring upgrade, the spring that actuates the valve is not adjusted, so when running unloaded the rear brakes provide next to no braking and the pads therefore last a really long time.
If you don't have uprated springs, then the suspension will compress under load and the rear braking bias will be much greater.

The 'I got 170000km' argument if somewhat flawed if you have a ute and do most of your running around unladen. I too got 150000km out of the rear shoes in my Courier and they had next to no wear still when I sold it. It did have a correctly adjusted proportioning valve and an alloy tray, so the rear brakes didn't get much use, even then they had a tendency to lock up as there was just no weight in the back end.
AnswerID: 588901

Follow Up By: gbc - Thursday, Aug 06, 2015 at 08:25

Thursday, Aug 06, 2015 at 08:25
I know the early prados had a load sensing valve but do the newer ones? If they have electronic brakeforce distribution (EBD) then the LSV would have been done away with? Hopefully? They were a seriously terrible piece of engineering.
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FollowupID: 856732

Follow Up By: Hoyks - Thursday, Aug 06, 2015 at 15:03

Thursday, Aug 06, 2015 at 15:03
Good point, it prompted me to go and have another look under my new ute.
The old mechanical proportioning valve has been deleted, but with a load on, the rear brakes would still have to do more work.

That said, it wouldn't hurt to have the calipers serviced when the pads are being changed, it would ensure that there isn't an underlying issue.

But I doubt they would both drag at the same rate if there was, the chances of both calipers having the same issue and wearing out a set of pads in the same km would be rather low.
Put in some good Bendix pads and see how they go, some of the compounds used in pads for Euro spec vehicles are really soft.
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FollowupID: 856758

Reply By: Member - Phil G (SA) - Wednesday, Aug 05, 2015 at 22:35

Wednesday, Aug 05, 2015 at 22:35
Sounds normal - like Hoyks said, there's a brake proportioning valve that increases the braking in the rear when the suspension is down with greater loads.
AnswerID: 588903

Reply By: Member - Blue M - Thursday, Aug 06, 2015 at 02:04

Thursday, Aug 06, 2015 at 02:04
Hi,
I remember when I got the 140,000 service done on my Hilux.
The person at the front counter informed me, "I had 10,000k left on my brake pads, and they should be replaced."

I asked him if that was, around town or on a trip.

He looked at me rather strangely, and said, what's the difference. 10,000k is 10,000k's.
I just smiled to my self and said "I would get them done on the next service."

40k is not a lot of kilometres, but if 90% was done towing, it may be the norm due to what was mentioned above about the brake proportioning valve.
Just keep an eye on the next set and see how they compare.

It's not much good comparing how many K's others have got out of theirs, as they may not drive in the same manner as yourself.

I know for a fact that my wife gets better fuel economy out of our vehicle than I do. Same car, different driving methods.

But it still sounds a bit less than normal.

Cheers


AnswerID: 588905

Reply By: Oscar H - Thursday, Aug 06, 2015 at 19:38

Thursday, Aug 06, 2015 at 19:38
Hi there,
Just a question were the pads genuine Toyota or aftermarket, Had similar on my wife's 80 series Landcruiser, genuine rears 90,000k fronts 120,000k. Thought OK wife's car will put in aftermarket, rears lasted 40,000k, after last service with genuine pads, I checked my guess 50% left after 40,000k?

There you go.
Regards
John h
AnswerID: 588943

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