Overview
The Baer Brakes S4 front brake system, part number 4301438MG, is a front disc brake kit in Monster Green for GM G-Body cars, S10 and S15 pickups, and S10 and S15 Blazer and Jimmy models. The 11 inch SS4 Plus is built like the larger systems in a more compact package for 15 inch wheels.
A 4-piston S4 caliper squeezes an 11 inch, 2-piece slotted, drilled, zinc plated rotor. The billet aluminum hubs arrive pre-assembled with bearings packed in Redline synthetic grease, mounted on stock height spindles, and the rotors come with NAS high grade stainless hardware.
Key features
- S4 4-piston caliper manufactured in Phoenix, Az
- CNC machined from forged or billet aluminum made in the USA
- Monster Green powder coated finish
- Hard anodized aluminum pistons with stainless steel abutments
- Noise suppression clips included
- Dual dust/weather and pressure seals
- 2-piece slotted, drilled, zinc plated rotor with NAS stainless hardware
- Billet hubs with premium bearings, billet dust caps and stock height spindles
Stock height spindle considerations
Stock height spindles keep the brake geometry close to what the vehicle was built with, which matters for steering feel and wheel offset. Lift kits, lowering blocks and altered control arms change the relationship between the hub and the rotor, so a spindle that suits one ride height may not suit another.
Older GM G-Body and S10 chassis often have worn bushings and tie rod ends that affect how the front end feels under braking. Address those before judging the brakes, because a loose steering linkage can make pedal pull seem like a caliper problem. Check the rotor face for heat cracks after hard stops.
- Replace worn tie rod ends and ball joints
- Confirm wheel offset if changing wheel size
- Inspect rubber brake hoses for swelling
Specifications
| Brand | Baer Brakes |
|---|---|
| Part number | 4301438MG |
| UPC | 90127920459 |
| Caliper | S4, 4-piston fixed |
| Caliper color | Monster Green |
| Rotor type | 2-piece slotted, drilled, zinc plated |
| Rotor construction | Vented |
| Rotor outside diameter | 11.0 inch |
| Rotor thickness | 1.02 |
| Brake pad type | DR1 or HB100 (FMSI DR1) |
| Brake hose | Steel braided, DOT approved |
| Axle | Front |
| Lug count | 5 lug |
| Wheel bolt pattern | 5×4.75 |
| Wheel stud size | M12-1.50 x 51.5mm |
| Minimum wheel diameter | 15.0 inch |
| Spindles included | Yes, stock height |
| Template | S125A |
| Grade | Performance |
| Country of origin | USA |
Vehicle fitment
It fits Buick Regal (1978–1988), Chevrolet El Camino (1978–1987), Chevrolet Malibu (1978–1983), Chevrolet Monte Carlo (1978–1988), Chevrolet S10 (1982–2003), Chevrolet S10 Blazer (1983–1994), GMC S15 (1982–1990), GMC S15 Jimmy (1983–1991), Oldsmobile Cutlass (1978–1981 and 1985–1988), Oldsmobile Cutlass Supreme (1978–1988) and Pontiac Grand Prix (1978–1988).
Full-size Chevrolet and GMC C/K pickups do not appear on the list, and the Blazer and Jimmy entries end in 1994 and 1991. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Stock height spindles are already attached, so fitting the kit does not require a spindle change. Use the S125A template to check wheel clearance against the 15.0 inch minimum wheel diameter. Brake hydraulics need a proper bleed and a torque check on every fastener, so have a qualified technician finish the install and test pedal feel before driving.
What’s included
The kit includes the S4 calipers, 11 inch 2-piece rotors pre-assembled with NAS high grade stainless hardware, billet hubs with bearings and dust caps on stock height spindles, mounting brackets, stainless braided hoses and hardware.
