2004 YAMAHA YZ85 brake

5 - 18
CHAS
Front brake caliper
1. Install:

Sleeve boot 1
On brake caliper bracket 2.
5PA50490
2. Install:

Pin boot 1
On brake caliper 2.
NOTE:
Apply the lithium soap base grease on the pin
boot inner surface.
5PA50500
3. Install:

Brake caliper bracket 1

Bolt (brake caliper bracket) 2

Brake pad 3
5PA50510
T R..30 Nm (3.0 m · kg, 22 ft · lb)
4. Install:

Brake caliper 1
NOTE:

Apply the lithium soap base grease on the
guide pin 2.

Install the brake caliper into the guide pin
and turn it clockwise.
5PA50520
5. Install:

Brake caliper support bolt 1
NOTE:
Apply the lithium soap base grease on the
brake caliper support bolt.
5PA50530
T R..23 Nm (2.3 m · kg, 17 ft · lb)
FRONT BRAKE AND REAR BRAKE

5 - 19
CHAS
Rear brake caliper
1. Install:

Pad support 1

Brake pad 2

Pad pin 3
NOTE:

Install the brake pad fitted with brake pad
shim 4 on the brake caliper piston side.

Temporarily tighten the pad pins at this point.5PA50540
2. Install:

Brake caliper 1

Bolt (brake caliper front side) 2

Bolt (brake caliper rear side) 3

Plate

Protector 4

Bolt (protector) 5
3. Tighten

Pad pin 6
Brake master cylinder kit
1. Clean:

Brake master cylinder

Brake master cylinder kit
Clean them with brake fluid.
2. Install:

Brake master cylinder cup (primary) 1

Brake master cylinder cup (secondary) 2
To brake master cylinder piston 3.
NOTE:
Apply the brake fluid on the brake master cylin-
der cup.
WARNING
After installing, cylinder cup should be
installed as shown direction. Wrong instal-
lation cause improper brake performance.
ÈFront
ÉRear
5PA50550
T R..23 Nm (2.3 m · kg, 17 ft · lb)
T R..23 Nm (2.3 m · kg, 17 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
T R..18 Nm (1.8 m · kg, 13 ft · lb)
ÈÉ
5PA50560
ÈÉ
5PA50570
FRONT BRAKE AND REAR BRAKE

5 - 20
CHAS
3. Install:

Spring 1
To brake master cylinder piston 2.
NOTE:
Install the spring at the smaller dia. side.
ÈFront
ÉRear
ÈÉ
5PA50580
4. Install:
[Front]

Brake master cylinder kit 1

Washer 2

Circlip 3

Brake master cylinder boot 4
To brake master cylinder 5.
[Rear]

Brake master cylinder kit 1

Push rod 2

Circlip 3

Brake master cylinder boot 4
To brake master cylinder 5.
NOTE:

Apply the brake fluid on the brake master cyl-
inder kit.

Apply the lithium soap base grease on the tip
of the push rod.

When installing the circlip, use a long nose
circlip pliers.
ÈFront
ÉRear
Front brake master cylinder
1. Install:

Brake master cylinder 1

Brake master cylinder bracket 2

Bolt (brake master cylinder bracket) 3
NOTE:

Install the bracket so that the arrow mark
a
face upward.

First tighten the bolts on the upper side of the
brake master cylinder bracket, and then
tighten the bolts on the lower side.
È
5PA50590
É
5PA50600
T R..9 Nm (0.9 m · kg, 6.5 ft · lb)
5PA50610
FRONT BRAKE AND REAR BRAKE

5 - 21
CHAS
2. Install:

Brake lever 1

Bolt (brake lever) 2

Nut (brake lever) 3
NOTE:
Apply the lithium soap base grease on the
brake lever sliding surface, bolt and contacting
surface of the brake master cylinder piston.
Rear brake master cylinder
1. Install:

Reservoir hose 1

Reservoir tank 2
5PA50620
T R..6 Nm (0.6 m · kg, 4.3 ft · lb)
T R..6 Nm (0.6 m · kg, 4.3 ft · lb)
5PA50630
2. Install:

Brake master cylinder 1

Bolt (brake master cylinder) 2
5PA50640
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
3. Install:

Brake pedal 1

Spring 2

O-ring 3

Washer 4

Cotter pin 5
NOTE:
Apply the lithium soap base grease on the
brake pedal shaft and O-rings.5PA50650
4. Install:

Pin 1

Washer 2

Cotter pin 3
NOTE:
After installing, check the brake pedal height.
Refer to “REAR BRAKE ADJUSTMENT” sec-
tion in the CHAPTER 3.
5PA50655
FRONT BRAKE AND REAR BRAKE

5 - 22
CHAS
Front brake hose
1. Install:

Copper washer 1

Brake hose 2

Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a directs as shown and lightly
touches the projection b on the brake
master cylinder.
5PA50660
T R..30 Nm (3.0 m · kg, 22 ft · lb)
5PA50670
2. Install:

Protector 1

Bolt (protector) 2
NOTE:
Fit the brake hose into the guides a of the pro-
tector.
5PA50680
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
3. Install:

Brake hose holder 1

Bolt (brake hose holder) 2
NOTE:

Align the brake hose holder with the projec-
tion a on the front fork and clamp the brake
hose.

Pass the brake hose behind the rib b on the
front fork.
5PA50690
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
FRONT BRAKE AND REAR BRAKE

5 - 23
CHAS
4. Install:

Copper washer 1

Brake hose 2

Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a lightly touches the projection b on
the brake caliper.
5PA50700
5PA50710
T R..26 Nm (2.6 m · kg, 19 ft · lb)
Rear brake hose
1. Install:

Copper washer 1

Brake hose 2

Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a directs as shown and lightly
touches the projection b on the brake
master cylinder.
5PA50720
5PA50730
T R..26 Nm (2.6 m · kg, 19 ft · lb)
FRONT BRAKE AND REAR BRAKE

5 - 24
CHAS
2. Install:

Copper washer 1

Brake hose 2

Union bolt 3
WARNING
Always use new copper washers.
CAUTION:
Install the brake hose so that its pipe por-
tion a lightly touches the projection b on
the brake caliper.
5PA50740
5PA50750
T R..26 Nm (2.6 m · kg, 19 ft · lb)
3. Install:

Brake hose holder 1

Screw (brake hose holder) 2
5PA50760
T R..1 Nm (0.1 m · kg, 0.7 ft · lb)
FRONT BRAKE AND REAR BRAKE

5 - 25
CHAS
Brake fluid
1. Fill:

Brake fluid
Until the fluid level reaches “LOWER” level
line a.
WARNING

Use only the designated quality brake
fluid:
otherwise, the rubber seals may deterio-
rate, causing leakage and poor brake per-
formance.

Refill with the same type of brake fluid;
mixing fluids may result in a harmful
chemical reaction and lead to poor perfor-
mance.

Be careful that water does not enter the
master cylinder when refilling. Water will
significantly lower the boiling point of the
fluid and may result in vapor lock.
CAUTION:
Brake fluid may erode painted surfaces or
plastic parts. Always clean up spilled fluid
immediately.
ÈFront
ÉRear
2. Air bleed:

Brake system
Refer to “BRAKE SYSTEM AIR BLEED-
ING” section in the CHAPTER 3.
Recommended brake fluid:
DOT #4
È
5PA50770
É
5PA50780
3. Inspect:

Brake fluid level
Fluid at lower level → Fill up.
Refer to “BRAKE FLUID LEVEL INSPEC-
TION” section in the CHAPTER 3.
FRONT BRAKE AND REAR BRAKE