Rear brake proportioning valve??? - Toyota Yaris Forums

PetersRedYaris · 03-24-2007, 10:01 PM

My rear brakes are weak, and it's not because they're drum brakes. This winter while on snow packed roads I noticed that no matter how hard I push the brake pedal, the rear WILL NOT lock up (no ABS either

). I could stop faster by pushing the brake pedal and pulling the e-brake simultaneously so that all 4 wheels would lock. Can this be adjusted by the proportioning valve, or could I crank the brake shoe adjusters a few notches? My e-brake has to be pulled to far it seems before it grabs. Maybe the shoes are just out of adjustment. What do you think?

PS. Don't give me any "drum bakes are weak" answers. I understand discs are better but drums are plenty strong enough to lock the stock Potenza RE92's at 10 MPH on snow packed roads.

Moose · 03-24-2007, 10:05 PM

It's probably because of the snow- wet weather adversely affects the performance of drums.

PetersRedYaris · 03-24-2007, 10:10 PM

No, thats not it.

ChinoCharles · 03-24-2007, 10:19 PM

You checked the cable, right?

PetersRedYaris · 03-25-2007, 12:03 AM

Quote:

Originally Posted by ChinoCharles

You checked the cable, right?

Could you be more specific? Do you mean the nut to adjust the cable tension right on the bottom of the e-brake handle?

Black Yaris · 03-25-2007, 02:05 AM

Go to the dealer, tell them, I am not sure if we have self adjusting rear brakes or not, if they are self adjusting you are SOL

largeorangefont · 03-25-2007, 02:18 AM

Toyota did that for safety so people don't go spinning down the road like tops in their Yarii. That's how they can get away without putting ABS on the car.

This is probably also why the brakes are very soft and light until you really push the pedal.

Pavel Olavich · 03-25-2007, 04:32 AM

Quote:

Originally Posted by largeorangefont

Toyota did that for safety so people don't go spinning down the road like tops in their Yarii. That's how they can get away without putting ABS on the car.

This is probably also why the brakes are very soft and light until you really push the pedal.

Sorry but that reason sounds lame....I would suggest the OP take his car to the dealer and stop reading guesses from this site...I can get my 2007 LB back tires to lock up, no problem.....

hasher22 · 03-25-2007, 08:49 AM

yea i suggest take it to the dealer and get it checked out.....if they say anything about replacing it and u know for a "fact" that it doesnt need replacing or whatever.......they are just taking your money....

Australia has abs as standard :)

joey1320 · 03-25-2007, 12:39 PM

the drums should lock as the front if you press the pedal all the way like you said. since you said that the ebrake is high when engaged you may have the shoes out of adjustment. take it to the dealer and tell them your problem.

PetersRedYaris · 03-25-2007, 12:49 PM

Quote:

Originally Posted by joey1320

the drums should lock as the front if you press the pedal all the way like you said. since you said that the ebrake is high when engaged you may have the shoes out of adjustment. take it to the dealer and tell them your problem.

All right, all right, I'll take it ot the dealer. It's such an inconvienence though.

drell42 · 03-25-2007, 03:26 PM

The thing is that the yaris, al least in Canada, has EBD, wich makes it so that under heavy breaking that the breaking force is pretty close to equal. So your rears are extreamly unlikely to lock-up, even under snowy conditions

fu_im_from_texas · 03-25-2007, 04:48 PM

...on other toyota's I've owned ('84 corrolla, '87 pick up, and a '94 corrolla, all had rear drums) you could adjust the rear brakes by 1) drive in reverse (5-10 mph) 2) then quickly stop using the hand brake...

I looked in the owners manual, and couldnt find any info...but its worth a shot.

largeorangefont · 03-25-2007, 09:49 PM

Quote:

Originally Posted by Pavel Olavich

Sorry but that reason sounds lame....I would suggest the OP take his car to the dealer and stop reading guesses from this site...I can get my 2007 LB back tires to lock up, no problem.....

I would definately take it to the dealer to have them look at it.

I've never driven a car with the braking feel like the Yaris. An Xa with ABS doesn't have the same feel. It feels like a normal car. with a progressive feel. It is very tight and brakes hard with little effort.

In the Yaris you have to push the pedal down pretty far to really get it to stop. It is more like a linear feel, and very soft at the top of the pedal travel. It isnt a bad thing, you just get used to it.

I've have yet to lock a wheel up in my LB. I did put better tires on it in the first week, so that is probably a big part of it. I think the brakes perform pretty well.

PetersRedYaris - Take a picture or count the clicks you have to pull up on your ebrake. That at least will see if the shoes are adjusted correctly.

AaronATL · 03-25-2007, 10:01 PM

brakes... brakes... brakes.....

ahhh who needs em anyway when we could use arrestor cables

Yarisworld!!!

PetersRedYaris · 03-25-2007, 11:23 PM

Quote:

Originally Posted by largeorangefont

Take a picture or count the clicks you have to pull up on your ebrake. That at least will see if the shoes are adjusted correctly.

Seven (7) clicks untill it holds the car. Now many clicks do you all get when you pull up on the e-brake?

joey1320 · 03-26-2007, 12:10 AM

since you dont want to go to the dealer, have you checked behind the backing plate for any kind of adjusting hole?

03-24-2007, 10:01 PM	#1
PetersRedYaris View User's Garage Drives: 2005 Scion xB Join Date: Nov 2006 Location: The Black Hills of South Dakota Posts: 1,059	Rear brake proportioning valve??? My rear brakes are weak, and it's not because they're drum brakes. This winter while on snow packed roads I noticed that no matter how hard I push the brake pedal, the rear WILL NOT lock up (no ABS either ). I could stop faster by pushing the brake pedal and pulling the e-brake simultaneously so that all 4 wheels would lock. Can this be adjusted by the proportioning valve, or could I crank the brake shoe adjusters a few notches? My e-brake has to be pulled to far it seems before it grabs. Maybe the shoes are just out of adjustment. What do you think? PS. Don't give me any "drum bakes are weak" answers. I understand discs are better but drums are plenty strong enough to lock the stock Potenza RE92's at 10 MPH on snow packed roads.

03-24-2007, 10:05 PM	#2
Moose Resident Redneck Drives: 07 Polar White Yaris Sedan 5M Join Date: Jul 2006 Location: Cumming, GA Posts: 265	It's probably because of the snow- wet weather adversely affects the performance of drums. __________________ My other rides: 2003 Honda Civic LX Coupe 5M- S/C K24 w/ LSD coming soon! 1999 Honda Civic EX Coupe 5M w/ B18 powaa 1985 Toyota Celica GTS Coupe 5M- track whip http://www.importlounge.com

03-25-2007, 08:49 AM	#9
hasher22 Look mum no stars!! Drives: Toyota Yaris 06 Join Date: Aug 2006 Location: Australia Sydney Posts: 1,469	yea i suggest take it to the dealer and get it checked out.....if they say anything about replacing it and u know for a "fact" that it doesnt need replacing or whatever.......they are just taking your money.... Australia has abs as standard :) __________________

03-25-2007, 04:48 PM	#13
fu_im_from_texas Drives: Liftback Join Date: Jan 2007 Location: Texas Posts: 137	...before you take it to the dealer ...on other toyota's I've owned ('84 corrolla, '87 pick up, and a '94 corrolla, all had rear drums) you could adjust the rear brakes by 1) drive in reverse (5-10 mph) 2) then quickly stop using the hand brake... I looked in the owners manual, and couldnt find any info...but its worth a shot.

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03-24-2007, 10:10 PM	#3
PetersRedYaris View User's Garage Drives: 2005 Scion xB Join Date: Nov 2006 Location: The Black Hills of South Dakota Posts: 1,059	No, thats not it.

03-24-2007, 10:19 PM	#4
ChinoCharles Banned Drives: LB Join Date: Jul 2006 Location: OH Posts: 7,787	You checked the cable, right?

03-25-2007, 02:05 AM	#6
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	Go to the dealer, tell them, I am not sure if we have self adjusting rear brakes or not, if they are self adjusting you are SOL

03-25-2007, 02:18 AM	#7
largeorangefont Break'em off some. View User's Garage Drives: 07 Yaris LB, 04 Cobra Join Date: Jan 2007 Location: So Cal, OC Posts: 854	Toyota did that for safety so people don't go spinning down the road like tops in their Yarii. That's how they can get away without putting ABS on the car. This is probably also why the brakes are very soft and light until you really push the pedal.

03-25-2007, 12:39 PM	#10
joey1320 View User's Garage Drives: Yaris LB Join Date: Mar 2007 Location: Lakewood, Ohio Posts: 538	the drums should lock as the front if you press the pedal all the way like you said. since you said that the ebrake is high when engaged you may have the shoes out of adjustment. take it to the dealer and tell them your problem.

03-25-2007, 03:26 PM	#12
drell42 Drives: Blank Join Date: Feb 2006 Location: Not here Posts: 74	The thing is that the yaris, al least in Canada, has EBD, wich makes it so that under heavy breaking that the breaking force is pretty close to equal. So your rears are extreamly unlikely to lock-up, even under snowy conditions

03-25-2007, 10:01 PM	#15
AaronATL Drives: 2007 yaris hatchback Join Date: Feb 2007 Location: J ' Burg Posts: 36	brakes... brakes... brakes..... ahhh who needs em anyway when we could use arrestor cables Yarisworld!!!

03-26-2007, 12:10 AM	#17
joey1320 View User's Garage Drives: Yaris LB Join Date: Mar 2007 Location: Lakewood, Ohio Posts: 538	since you dont want to go to the dealer, have you checked behind the backing plate for any kind of adjusting hole?