4.50” (114.3 mm)

4.88” (124.0 mm)

4.85” (123.2 mm)

4.85” (123.2 mm)

B

6.99” (177.5 mm)

6.99” (177.5 mm)

7.02” (178.3 mm)

7.33” (186.2 mm)

8.27” (210.1 mm)

8.27” (210.1 mm)

C

4.75” (120.7 mm)

D

M16 X 1.5-6g

Inlets

3/8” -18 NPTF (M16 x 1.5-6H)

XB

15 mm

AIR DISC

NOTE: All chart measurements are in both inches and metric.

Note: Product information and specifications subject to change without notice.

93

www.mgmbrakes.com

94

SECTION 8
Page(s)

.R4A

Remote Cylinder............................................................................................................................96-97

.R5AHD

Remote Cylinder, Heavy-Duty.......................................................................................................96-97

.R7A (SAAR)

Remote Cylinder, Spring Applied, Air Released............................................................................98-99

.R8H (SAHR)

Remote Cylinder, Spring Applied, Hydraulic Released.................................................................98-99

MGM Brakes R4A & R5AHD Remote Mount Cylinders...are the original spring brake invented in the rugged logging country of Northern
California. These cylinders were introduced by MGM Brakes in 1956 as the world’s first spring-actuated parking and emergency brake
actuators for commercial vehicles. These “pull-to-actuate” cylinders were designed for axle-mount using various weld-on and bolt-on
mounting brackets and linkage arms.
R7A (SAAR) and R8H (SAHR) drive-line brakes are developed as replacements for manually operated lever applied “drive-line” brakes.
Mounted to the frame rail, the actuator utilizes a cable to apply parking force to a drum mounted on the drive-line. An optional electronic
“travel” sensor provides the operator with information pertaining to the position of the push rod - “applied” or “released”.
Today, these high-quality air-actuated cylinders have been adapted to such diverse non-automotive usage as dump truck end-gate
actuators, emergency brake actuators on massive logging and commercial fishing winches and numerous other special applications.

How Remote Mount Cylinders Operate

When the end-gate is closed, spring pressure within the cylinders To unlatch the end-gate, the operator applies air to the cylinder
moves the latches into the latched position, reducing the risk the through a valve located in the cab of the vehicle. As air pressure
end-gate may inadvertently swing open.
builds within the cylinder it forces the piston to move, compressing
the spring(s) and extending the push-rod which moves the endgate latches into the open position.

Note: Product information and specifications subject to change without notice.

95

www.mgmbrakes.com

REMOTE CYLINDERS

.Section 8: Remote Mount Cylinders....................................................94-99

R4A & R5AHD
Standard Stroke Model

Remote R4A

Remote R5AHD

VMRS# 013-004-027

VMRS# 013-004-027

A
B

X*

A
B

E

D

X*

D

E

C

C

F

F

REMOTE CYLINDERS

* Note: X-dimension (7.00”, 15.00” etc.) is measured from lockpin hole in piston rod outward to rod end. Note that the lockpin hole appears from within the cylinder only after the cylinder is
charged with minimum 85 psi air pressure. Boot needs to be removed to see lockpin hole.

P/N Series

5004

5005

Model

R4A

R5AHD

Size

4

5

Stroke

4.50” (114.3 mm)

4.20” (106.7 mm)

P/N External 20” (508.0 mm) Rod

5004010

N/A

P/N External 15” (381.0 mm) Rod

5004013

5005012

P/N Internal 7” (177.8 mm) Rod

5004014

5005014

Wt.Combination (lb/kg)

13.5 lb (6.1 kg)*

19.6 lb (8.9 kg)*

A

11.12” (282.4 mm)

10.50” (266.7 mm)

B

7.50” (190.5 mm)

9.38” (238.3 mm)

C

4.38” (111.3 mm)

6.12” (155.4 mm)

D

5.69” (144.5 mm)

5.12” (130.0 mm)

E (External Thread)

3/4” - 16 UNF x 10.75” (273.1 mm) long

F (Internal Thread)

1/2” - 20 UNF x 3.00” (76.2 mm) DEEP

Inlet

3/8” - NPTF

NOTE: * Weight varies with external rod size.

Standard Assembly Part Numbers & Service Parts
Part Number

Description Of Parts

9004003

Kit - Boot & Clamp - Remote

9008001

Kit - Side Bushings R4A/R5AHD (for Trunnion Bolt Mount)

Note: Product information and specifications subject to change without notice.

www.mgmbrakes.com

96

R4A & R5AHD
Extension rod not sold separately.

1A

1

4

7

2A

3

5

8

6

Assemblies

Kit P/N and Quantities

Model

P/N

R4A

5004010

External Thread 20.00” (508.0 mm) Rod

Rod Specifications

3.00” (76 mm)

Thread Length

R4A

5004013

External Thread 15.00” (381.0 mm) Rod

10.62” (269.75 mm)

R4A

5004014

Internal Thread 7.00” (177.8 mm) Rod

3.00” (76 mm)

R5AHD

5005012

External Thread 15.00” (381.0 mm) Rod

10.75” (273.05 mm)

R5AHD

5005014

Internal Thread 7.00” (177.8 mm) Rod

3.00” (76 mm)

Key

P/N

1

8005001

Gimbal Bracket - R4A

1

8005013

Gimbal Bracket - R5AHD

1A

8062001

Shock Pad - R4A

1A

8062002

Shock Pad - R5AHD

2

8003003

2A

8141002

9050019

9050027

9050028

9050035

2
1
1
1

Part Description
2

1

1
1

2

1

Trunnion Bolt

4

2

2

2

Star Lock Washer

4

2

2

2

3

8130011

Hex Nut 1/2”- 20 UNF

4

8092006

Sliding Clevis 1/2”- UNF

4A

8092010

Sliding Clevis 3/4” - UNF

5

8038001

Yoke Pin 1/2” (12.7 mm)

6

8151001

Cotter Pin

7

8130002

Hex Nut 3/4”- 16 UNC

4

8

8140002

Lockpin Washer 3/4” (19.1 mm) (inside diameter)

2

9

8055017

Extension Rod 1/2” UNF x 24”

1

Note: Product information and specifications subject to change without notice.

97

www.mgmbrakes.com

REMOTE CYLINDERS

2

R7A/R8H
Standard Stroke Model

Remote R7A

Remote R8H
VMRS# 013-004-027

VMRS# 013-004-027

R8H (SAHR)
MODEL

R7A (SAAR)
MODEL

SPRING APPLIED
HYDRAULIC RELEASE

SPRING APPLIED
AIR RELEASE

REMOTE CYLINDERS

R7A (SAAR) & R8H (SAHR) Model Features
• Compact Design
• Light Weight Aluminum
• Electronic Stroke Sensor

Service Kits & Replacement Parts
1

9051001

Sensor Kit - R7A (SAAR) & R8H (SAHR) with 3 pin connector

1A

9051004

Sensor Kit - Blue Diamond R7A (SAAR) with 5 pin connector

1B

9051005

Sensor Kit - Blue Diamond R8H (SAHR) with 6 pin connector

2

9041005

Cartridge - R8H (SAHR) Hydraulic Unit

3

8004002

Boot - R7A (SAAR)

3A

8004010

Boot - R8H (SAHR)

1, 1A, 1B

2

3, 3A

Note: Product information and specifications subject to change without notice.

www.mgmbrakes.com

98

R7A/R8H
R7A (SAAR) and R8H (SAHR) Drive-line Brakes were developed as replacements for manually operated lever applied “drive-line” brakes
on class 6 and 7 vehicles. Mounted to the frame rail, the actuator utilizes a cable to apply parking force to a drum mounted on the driveline. An optional electronic “travel” sensor provides the operator with information pertaining to the position of the push rod – “applied” or
“released”.

A R8H (SAHR) (@ ZERO STROKE - LONGEST OVERALL LENGTH)

PRESSURE PORT
E

A R7A (SAAR)

E

D

G

B SAAR

C

B SAHR

F

Model

SAAR

SAHR

Series

R7A

R8H

Part Number

5007001

5008001

Stroke of Unit

2.75” (69.8 mm)

2.75” (69.8 mm)

Medium

Air

DOT3 & DOT4 Brake Fluid