At a Glance
- SKU: 4857020
PRODUCT INFORMATION
Product Details
Trailer Hydraulic Surge Brake Actuator
Dexter / Titan Model 10 Hydraulic Brake Actuator with Solenoid — 6-Hole Adjustable Channel Mount
Hydraulic surge brake actuator for disc-brake trailer systems using a 6-hole offset bolt-on channel setup. Includes solenoid backup valve and protective cover for controlled backing operation when wired correctly.
Part Number: 4857020 Model 10 Disc Brake 12,500 lb GVWR Solenoid Valve & Cover
Overview
This Dexter / Titan Model 10 hydraulic surge brake actuator is the 6-hole offset disc-brake configuration identified as part number 4857020. It is built for compatible trailer hydraulic disc brake systems where a bolt-on 5/8" mounting setup, matching Model 10 outer case, and reverse solenoid function are required.
R&P Service Insight
Model 10 surge actuators must be matched by brake type, mounting style, tongue configuration, and hydraulic setup. Disc brake versions require the correct master cylinder and backup solenoid arrangement for proper braking and backing operation.
- Disc Brake Match: This listing is for a disc-brake actuator configuration, not a drum-brake-only setup.
- Mounting Match: Verify the trailer is set up for a 6-hole offset Model 10 channel and bolt-on 5/8" attachment.
- Solenoid Function: Reverse lockout function requires correct wiring to the tow vehicle backup light circuit.
R&P Knowledge Hub
Compatibility: Product cross-reference identifies disc-brake part number 4857020 as a 6-hole offset Model 10 actuator with solenoid valve and cover.
Vehicle / System Fit: Designed for trailer hydraulic surge brake systems using compatible disc brakes and a straight 3" wide trailer tongue setup.
Installation Notes: Model 10 bolt-on applications use heavy mounting hardware and require the actuator, hydraulic lines, brakes, and backup solenoid wiring to be installed and tested correctly.
Performance Insight: Surge braking uses trailer momentum during deceleration to move the actuator and apply hydraulic pressure to the trailer brakes. The solenoid backup valve helps prevent unwanted brake application while reversing.
Brand & Fitment Note
Selling Brand: Dexter / Titan Model 10
Application Reference: Dexter, Titan, Model 10, disc brake, and 6-hole offset references describe the actuator family and supported configuration for this part number.
What This Means: This listing is for part number 4857020, a Model 10 disc-brake actuator configuration with solenoid valve and cover.
Before Ordering: Verify part number, brake type, trailer tongue width, mounting bolt size, channel style, hydraulic line connection, wiring requirements, and included components before installation.
R&P Repair Insight
Actuator replacement should not be based on appearance alone. Model 10 actuator versions vary by brake type, channel offset, coupler/lunette setup, inner slide, outer case, and whether a solenoid valve and cover are included.
- Brake Type Check: Confirm your trailer uses hydraulic disc brakes before replacing with this configuration.
- Inner / Outer Check: 4857020 is cross-referenced with inner 4848700183 and outer 2478200.
- Final System Check: Fill, bleed, test, and inspect the hydraulic system after installation before towing.
Features
Model 10 Surge Actuator
Hydraulic surge actuator designed for compatible heavier recreational and light industrial trailer brake applications.
Disc Brake Configuration
Identified in the Model 10 product list as the disc-brake version for this 6-hole offset actuator setup.
Solenoid Valve & Cover
Includes the solenoid backup valve and cover configuration used for reverse lockout operation.
6-Hole Offset Bolt-On Mount
Product table identifies the attachment as bolt-on 5/8" with 6-hole offset channel configuration.
Specifications
| Specification | Detail |
|---|---|
| Part Number | 4857020 |
| Brand / Family | Dexter / Titan Model 10 |
| Product Type | Hydraulic surge brake actuator |
| Brake Application | Hydraulic disc brake trailer systems |
| Maximum GVWR | 12,500 lb |
| Maximum Tongue Load | 1,250 lb |
| Description | 6-hole offset, with solenoid valve and cover |
| Attachment | Bolt-on 5/8" |
| Inner Reference | 4848700183 |
| Outer Reference | 2478200 |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Trailer hydraulic surge brake system |
| Primary Fit | Trailers requiring Model 10 6-hole offset disc-brake actuator configuration |
| Tongue Style | Straight 3" wide trailer tongue where mounting pattern and structure match |
| Notes | Confirm brake type, tongue width, channel offset, bolt pattern, hydraulic fittings, and solenoid wiring before installation. |
Included Components
| Quantity | Item |
|---|---|
| 1 | Dexter / Titan Model 10 hydraulic surge brake actuator, part number 4857020 |
| Included | Solenoid backup valve configuration |
| Included | Protective backup valve cover configuration |
| Not confirmed | Mounting hardware, hydraulic brake lines, coupler/lunette attachment, and additional trailer-side brake components unless separately shown or stated |
4857020 Product Cross-Reference
| Drum Brake Part | Disc Brake Part | Description | Attachment | Inner | Outer |
|---|---|---|---|---|---|
| 4857220 | 4857020 | 6-hole offset, with solenoid valve and cover | Bolt-on 5/8" | 4848700183 | 2478200 |
Model 10 Actuator Parts List
Reference table for the Model 10 actuator exploded diagram. Use the key numbers to identify service parts shown in the diagram above. Some service parts vary by brake type, mounting channel, finish, or actuator version.
| Key # | Part Number | Description | Qty |
|---|---|---|---|
| 1 | 1601600 | Outer case, painted | 1 |
| 2 | 1020900 | Bearing, top & bottom, .125" thick | 6 |
| 3 | 1242700 | Bearing, side, .075" thick | 8 |
| 4 | 1601900 | Front roller | 1 |
| 5 | 0828800 | Front roller bolt | 1 |
| 6 | 0799700 | Cotter pin, 1/8" x 1" | 2 |
| 7 | 1601800 | Front roller cover | 1 |
| 8 | 0776800 | Breakaway chain | 4 |
| 9 | 1055500 | S-hook | 2 |
| 10 | 1054100 | Breakaway lever assembly | 1 |
| 11 | 1055200 | Weather seal | 1 |
| 12 | 1052600 | Breakaway lock - left hand | 1 |
| 13 | 1052700 | Breakaway lock - right hand | 1 |
| 14 | 0793800 | Lockwasher, 5/16" standard | 8 |
| 15 | 0794900 | Bolt - hex 5/16" -18NC x 5/8" long | 4 |
| 16 | 1507000 | Cylinder cover | 1 |
| 17 | 0794800 | Bolt - hex 5/16" -18NC x 1/2" long | 4 |
| 18 | 1593300 | Inner slide | 1 |
| 19 | 2374400 | Master cylinder, 1-1/4" bore, drum brake | 1 |
| * | 4831600 | Master cylinder, drum, with 1209800 orifice | |
| 4747100 | Master cylinder, 1-1/4" bore, disc brake | ||
| 20 | 0838800 | Cylinder bracket, right hand | 1 |
| 21 | 1250300 | Filler cap, included in 2374400 | 1 |
| 22 | 0774500 | Gasket, for use with 1209900 orifice | 1 |
| 23 | 1209800 | Orifice connector, drum brake, 1/8" NPT | 1 |
| 1209900 | Orifice, drum, early type, 1/2" NF thread | 1 | |
| 24 | 0838900 | Cylinder bracket, left hand | 1 |
| 25 | 0827100 | Bolt - hex 3/8" - 16NC x 3" long | 2 |
| 26 | 0797600 | Hex nut 3/8" - 16NC | 2 |
| 27 | 1255200 | Star lockwasher 3/8" | 2 |
| 28 | 0830100 | Push rod block | 1 |
| 29 | 1242600 | Damper | 2 |
| 30 | 0829100 | Rear roller | 2 |
| 31 | 1593500 | Master pin | 2 |
| 32 | 0815200 | Cotter pin 3/16" x 1-1/4" | 2 |
| 33 | 1593400 | Damper pin | 2 |
| 40 | 0793700 | Lockwasher 1/2" | 1 |
| 41 | 0798500 | Hex nut 1/2" - 13NC | 1 |
| 42 | 0144901 | Grease zerk | 1 |
| 46 | 2477700183 | Outer case, 2.5" offset mounting channel, plated | 1 |
| 2477700317 | Outer case, 2.5" offset mounting channel, painted | 1 | |
| 47 | 2478200 | Outer case, 1" offset mounting channel, plated | 1 |
| 1685500 | Outer case, 1" offset mounting channel, painted | 1 | |
| 48 | 1861900 | Nylon washer | 2 |
| 49 | 2374600 | Drum brake master cylinder assembly complete with brackets | 1 |
| 4749501042 | Disc brake master cylinder assembly complete with brackets | 1 | |
| 50 | 4836100183 | Back up valve cover, plated | 1 |
| 4836100 | Back up valve cover, painted | ||
| * | 1018700 | Master cylinder repair kit | |
| 51 | 4748800 | Solenoid back up valve, male 1/8" NPT and female 3/8" x 24 NF with inverted seat | 1 |
| * | 4750200 | Adapter 1/2" NF to 1/8" NPT, for back up valve | 1 |
| * = not shown | |||
Verify part number 4857020, disc brake application, Model 10 configuration, 6-hole offset mounting, bolt-on 5/8" attachment, trailer tongue structure, hydraulic fittings, solenoid wiring, and included components before installation. Mounting hardware, brake lines, coupler/lunette attachments, and additional trailer-side brake components are not listed as included unless separately shown or confirmed.
4857020 Dexter Titan Model 10 actuator, Dexter Model 10 disc brake actuator, Titan Model 10 4857020, hydraulic surge brake actuator with solenoid, 6-hole offset actuator with valve and cover, 12,500 lb Model 10 actuator, bolt-on 5/8 actuator, 4848700183 inner 2478200 outer, trailer disc brake surge actuator, reverse lockout solenoid actuator
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