sallythesilverdragon

does anybody know the proper way to bleed the brakes on a 1987 Pickup 4x4.

abecedarian

right rear, left rear, right front, left front, lspv

mudrucker25

ok im still new to all of this whats the ispv?

T-1000

Load sensing proportion valve

abecedarian

lspv is the valve above the rear axle- has a lever that crosses over the frame and bolts to the rear axle.

TacoNut

LSVP - Load Sensing Proportional Valve. This adjusts the pressure being sent to the rear wheels, depending on the load in the back.

abecedarian

also has 3 brake lines connected to it- one from the rear circuit on the brake master cylinder, one from the front circuit (should be tee'd in by the passenger side front wheel) and one line that goes down and splits to the rear brake cylinders.

NorCalWheeler

You will need two people. One person in the truck in the driver seat and one to open and close the bleeder value, the values should be on the bottom of the caliper on the front brakes and in the back side of the brake plate thing for the back brakes. The person at the value opens the value and tells the person in the drivers seat to push down the brake pedal, then close the value and when the value is closed have the person let off the brakes. So basically open value, pushdown pedal, close value, and let off brake. I'm not positive about the value placement but it should be close, I've never bleed the brake on my yota but I have on friend's cars and it's the same on all cars, but I would understand if you waited for more advise.

abecedarian

and don't get confused- there is no 'bypass' letting pressure from the rear circuit bleed into the front circuit. They are completely separate.

sallythesilverdragon

good stuff. on the bleeder valves when the 2nd man in the driver seat pushes the pedal down, fluid should come out right? then close them up

NorCalWheeler

yes, just do it til it comes out smooth and doesn't feel like there is air in it

abecedarian

person pushing the pedal pushes the pedal, person on the bleeder valve opens it and closes it before the pedal hits the floor so the master cylinder doesn't get 'over extended'.

sallythesilverdragon

cool so just keep pumping to where it would normally stop then close the valve till a smooth stream of fluid comes out. awesome thanks brothers

abecedarian

press the pedal, press the pedal, press the pedal... open the valve, close the valve....
repeat as necessary.

nmtoy

Here is a useful article...
http://www.4x4wire.com/toyota/mainte...leedingbrakes/

Robb

briholt

Sorry for the revival of an old thread.

So, in my searches for bleeding a brake on our trucks (mine is 91 pickup 4wd 22re) I've seen various claims of the proper order.

The most general claim making the most sense is to bleed the longest brake line first, moving to the shortest brake line.

our trucks often have the lspv. I think mine is located just above the passenger rear tire, making it a tad shorter than the passenger rear..

So, it seems to me that the correct order would be

1. Drivers rear
2. Pass Rear
3. Lspv
4. Pass front
5. Drive front

But I've seen people say that it should be bled last.

What am I missing?

Thanks all

scope103

Toyota says: Master Cylinder, longest brake lines, then LSP & BV. http://web.archive.org/web/201203161.../3checksan.pdf
But if you'd rather go with "people say," be my guest.

2ToyGuy

I've always done the LSPV last, for the last 30+ years on my 87 Hilux, anyway, and it's worked very well so far. It IS what the FSM specs, so I figure it's the right way to do it.

Does that help at all?
Pat☺

briholt

So thanks for the snark. There isn't enough on the internet these days

What was helpful was that link. When I read my fsm I didn't see any mention of which line was longest, so I missed the lspv in item 6.

briholt

It does. I read the fsm several times and just didn't see the item about lspv because, again as far as I can tell, it doesn't say specifically that driver rear is furthest. I was looking for that and just didn't see it.