Wilwood Dynapro Single (DPS) Billet Caliper - 3.75in Lug Mount / 1.75in Piston / .38in Disc (120-9689)

Upgrade or replace your brake caliper with the Wilwood Dynapro Single (DPS) billet caliper. The 120-9689 is the newest generation of Wilwood's single-piston "Dyna" series caliper — a precision CNC-machined billet aluminium caliper with a 3.75" lug mount, 1.75" piston, and 0.38" disc thickness compatibility. Designed as a direct upgrade and replacement for applications previously using the Dynalite Single (DLS), the DPS combines superior strength with performance enhancements to deliver the best single-piston caliper in Wilwood's Dyna lineup.

Note: Universal caliper — requires a compatible mounting bracket for your specific application. Verify lug mount spacing (3.75in), piston diameter (1.75in), and disc thickness (.38in) compatibility with your rotor and bracket before ordering. Single caliper — order two for a complete axle.

Key Features:

• Wilwood Dynapro Single (DPS) — newest generation Dyna series single-piston caliper
• CNC-machined billet aluminium construction
• 3.75 inch lug mount spacing
• 1.75 inch piston diameter
• 0.38 inch disc (rotor) thickness
• Direct upgrade/replacement for Dynalite Single (DLS) applications
• Superior strength over previous Dyna series calipers
• Compatible with Wilwood DPS pad shape (shape 6812)
• 2.4 lbs

Performance Benefits:

• Billet Aluminium Construction: CNC-machined from billet aluminium for superior strength, dimensional accuracy, and surface finish compared to cast alternatives — providing a more rigid caliper body that resists flex under braking loads
• Improved Strength Over DLS: The DPS incorporates design improvements over the previous Dynalite Single (DLS) that increase caliper body strength and rigidity, improving braking consistency and pedal feel
• Lightweight: At 2.4 lbs, the DPS provides strong braking performance with minimal unsprung weight addition
• Wide Pad Compatibility: Compatible with Wilwood's full range of DPS pad compounds (shape 6812) — from street-oriented BP-10 and BP-20 to performance BP-40 and aggressive race compounds
• DLS Replacement: Direct upgrade path for existing DLS applications — the DPS uses the same pad shape (6812) and similar mounting dimensions, simplifying the upgrade process
• Versatile Application: 3.75" lug mount and 0.38" disc thickness suit a wide range of custom brake system applications

Specifications:

• Brand: Wilwood Engineering
• Part Number: 120-9689
• Series: Dynapro Single (DPS)
• Construction: CNC-machined billet aluminium
• Piston Count: 1
• Piston Diameter: 1.75 inches
• Mount Type: Lug mount
• Lug Mount Spacing: 3.75 inches
• Disc (Rotor) Thickness: 0.38 inches
• Pad Shape: 6812 (same as DLS)
• Weight: 2.4 lbs
• Barcode: 120-9689

Fitment and Application:

• Universal fitment — requires application-specific mounting bracket
• Direct upgrade replacement for Wilwood Dynalite Single (DLS) applications
• Compatible with 0.38" thick rotors
• 3.75" lug mount spacing — verify bracket compatibility
• Note: Single caliper — order two for a complete axle set
• Note: Brake pads, mounting bracket, brake lines, and hardware not included
• Note: Uses shape 6812 brake pads — same pad shape as the DLS for easy pad sourcing
• Installation: Professional installation recommended

What's Included:

• Wilwood Dynapro Single (DPS) billet caliper (120-9689) — single caliper
• Note: Brake pads, mounting hardware, and brake lines not included — verify with Wilwood documentation

Installation Notes:

• Professional installation recommended
• Design or source a caliper mounting bracket compatible with 3.75" lug mount spacing and your specific upright/rotor combination
• Verify caliper clearance to wheel, tyre, and suspension components before finalizing bracket
• Use Wilwood-recommended brake fluid and bleed procedure
• Bed brake pads after installation per Wilwood's recommended bedding procedure
• Inspect all brake system connections for leaks after installation

Dynapro Single (DPS) vs. Dynalite Single (DLS) — The Upgrade:

The Wilwood Dynapro Single (DPS) is the direct successor to the Dynalite Single (DLS) in Wilwood's single-piston caliper lineup. Both calipers share the same pad shape (6812) and similar lug mount dimensions, making the DPS a straightforward upgrade for existing DLS applications. The key improvements in the DPS over the DLS are in the caliper body design — the DPS uses an updated billet aluminium body with improved structural geometry that provides greater rigidity and strength under braking loads. This improved rigidity translates to more consistent braking performance and better pedal feel, as a stiffer caliper body deflects less under the hydraulic pressure generated during hard braking.

For builders who are designing a new brake system and choosing between the DPS and DLS, the DPS is the recommended choice — it is the current-generation product with improved performance, and Wilwood's ongoing development and support is focused on the DPS platform. For existing DLS users who are replacing a worn or damaged caliper, the DPS is a direct upgrade that improves on the DLS's performance without requiring changes to the pad shape or mounting bracket dimensions.

Single-Piston Caliper Applications:

Single-piston calipers like the Wilwood DPS are commonly used in several brake system applications: as rear calipers in custom brake systems where a smaller, lighter caliper is appropriate for the rear axle's lower braking force requirement; as parking brake calipers in custom rear brake setups; and in lighter vehicle applications where a single-piston caliper provides sufficient braking force without the added weight and cost of a multi-piston unit. The DPS's 1.75" piston diameter provides a moderate clamping force that suits these applications well, and its lightweight 2.4 lb construction minimizes unsprung weight addition.

Why Wilwood?

Wilwood Engineering is one of the most respected brake system manufacturers in North American motorsport, with decades of experience developing brake components for drag racing, road racing, oval track, and off-road competition. Their billet calipers are machined to precise tolerances and engineered with genuine knowledge of brake system dynamics and the specific requirements of performance and racing applications. For custom brake system builders who want a proven, high-quality single-piston caliper from a manufacturer with genuine motorsport credentials, the Wilwood DPS is a benchmark choice.

Perfect For:

• Custom brake system builds requiring a lightweight, high-quality single-piston caliper with 3.75" lug mount and 1.75" piston
• Existing Wilwood DLS users upgrading to the newer, stronger DPS caliper
• Rear brake caliper applications in custom brake systems where a single-piston caliper suits the rear axle's braking force requirement
• Lightweight vehicle brake builds wanting Wilwood's billet quality with minimal weight addition
• Anyone needing a genuine Wilwood Dynapro Single DPS caliper for a custom or replacement brake application

Perfect For: Custom brake system builders and Wilwood DLS users seeking the Dynapro Single DPS billet caliper — 3.75in lug mount, 1.75in piston, .38in disc, improved strength over DLS, shape 6812 pad compatibility.

Pro Tip: When replacing a DLS with a DPS, verify that your existing mounting bracket's lug mount spacing matches the DPS's 3.75" specification before assuming it's a direct bolt-on swap — while the DPS is designed as a DLS replacement, minor dimensional differences between caliper generations can affect bracket fit. Test-fit the caliper on the bracket before finalizing the installation.

DPS | Single Piston | Billet | 3.75in Lug Mount: Universal — requires mounting bracket. Single caliper — order 2 for axle set. Shape 6812 pads. Replaces DLS. 2.4 lbs. Professional installation recommended.

Upgrade your brake system with Wilwood 120-9689 Dynapro Single DPS — billet aluminium, 3.75in lug mount, 1.75in piston, .38in disc, the best single-piston Dyna caliper Wilwood has ever made.