A Guide to Suspension Shock Absorbers for the 1990-1996 Buick Roadmaster
Keep your classic land yacht floating smoothly with the right set of new aftermarket shocks.
- The rear Automatic Level Control (ALC) air suspension is a common failure point; converting to standard shocks and springs is a popular, reliable fix.
- When converting from rear air suspension, always replace the coil springs along with the shocks for proper ride height and support.
- For a comfortable, stock-like ride, choose KYB Excel-G or standard Monroe shocks. For a significantly firmer, more controlled ride, upgrade to Bilstein B6.
- Symptoms of bad shocks include excessive bouncing, a 'floaty' feeling on the highway, and a sagging rear end on models with air suspension.
Understanding Your Roadmaster's Suspension
The 1990-1996 Buick Roadmaster is a classic body-on-frame vehicle known for its smooth, comfortable ride. The front suspension is a standard setup with coil springs and separate shock absorbers. The rear suspension, however, can be one of two types:
- Standard Suspension: A conventional setup with coil springs and regular hydraulic or gas-charged shock absorbers.
- Automatic Level Control (ALC) Suspension: An optional system, common on wagons and many sedans, that uses special air-inflatable shock absorbers. A height sensor near the rear axle tells an on-board air compressor to add or release air from the shocks to keep the vehicle level, which is especially useful when the trunk is full or you're towing a trailer.
Common Problems with the Rear Air Suspension
While the ALC system provides a great ride when new, it is a known weak point as these vehicles age. The system is complex, with many potential failure points.
Key Failure Points of the ALC System:
- Leaking Air Shocks: The rubber air bladders on the shocks can dry rot and crack over time, causing air leaks. This is the most common failure.
- Failing Air Compressor: When there's a leak, the compressor runs constantly trying to keep the shocks inflated, leading to burnout.
- Bad Height Sensor: The sensor or its linkage can fail, preventing the system from knowing when to level the car.
- Cracked Air Lines: The plastic air lines that run from the compressor to the shocks can become brittle and break.
Choosing the Right Aftermarket Shocks
When your original shocks wear out, you have a few decisions to make. For the front, it's a straightforward replacement. For the rear, if you have the ALC system, you must decide whether to replace the air shocks or convert to a standard setup.
OEM vs. Aftermarket Quality
For a vehicle of this age, aftermarket parts are often the most practical and affordable choice. Original GM air shocks can be very expensive and hard to find. Aftermarket brands offer a wide range of options, from direct-fit air shocks to conversion kits and performance upgrades that can significantly change your Roadmaster's handling characteristics. Many owners find that a quality set of aftermarket shocks provides a ride that is as good as, or even better than, the original setup.
Option 1: Replace Rear Air Shocks
If you want to keep the auto-leveling feature, you can buy aftermarket air shocks from brands like Monroe. This is a good option if your compressor and sensors are still working and you frequently carry heavy loads or tow.
Option 2: Convert to Standard Shocks (Most Popular)
Most owners choose to eliminate the complex air system by installing a conversion kit. These kits replace the air shocks with a set of conventional shocks and, if needed, new coil springs designed to handle the vehicle's weight without air assistance. This is a permanent, reliable, and cost-effective solution that ends future air suspension headaches.
Pro Tip: When converting from air suspension, it's highly recommended to replace the coil springs at the same time. The original springs were designed to work with the air shocks and may not provide the correct ride height or support with standard shocks.
Brand Tiers for Your Roadmaster
Owner experiences on forums provide a good sense of how different brands perform on this specific vehicle.
- Good (Economy): Brands like FCS Struts and PRT offer budget-friendly replacements that will restore basic function. They are a good choice for a daily driver where cost is the primary concern.
- Better (Standard/OEM-Style): Monroe and KYB (Excel-G/GR2) are the most common choices. They offer a ride quality similar to or slightly firmer than the original factory shocks. Monroe offers both standard replacement shocks and the Gas-Magnum or Severe Service shocks, which are much firmer and often compared to police-package suspension. KYB is also a popular choice, known for providing a good balance of comfort and control.
- Best (Performance/Heavy-Duty): Bilstein (B6) and KYB (Gas-A-Just/Monomax) are premium options for owners who want improved handling and a firmer, more controlled ride. Bilstein shocks are highly regarded for their durability and performance, transforming the Roadmaster's handling from 'floaty' to firm and responsive. They are a significant upgrade, especially if you have converted from the rear air system and want to reduce body roll.
Known Issues, Recalls & TSBs
There was a recall (NHTSA Campaign #96V019000) for some 1994-1995 Roadmaster models concerning front lower control arm ball joint nuts that may not have been properly torqued. This issue could cause the ball joint to separate and lead to a loss of control. While not a shock absorber issue, it is a critical suspension component to be aware of. No widespread recalls or Technical Service Bulletins (TSBs) exist specifically for the shock absorbers themselves, but the failure of the rear ALC system is a well-documented common problem among owners.
| Part Type | Estimated Cost (Parts Only) |
|---|---|
| Front Shock Absorber (Pair) | $50 - $200 |
| Rear Standard Shock Absorber (Pair) | $50 - $250 |
| Rear Air Shock Absorber (Pair) | $150 - $350 |
| Rear Air-to-Standard Conversion Kit (Shocks & Springs) | $150 - $400 |
Frequently Asked Questions
Do I need to replace all four shocks at once?
It is highly recommended to replace shocks in pairs (both front or both rear). Replacing all four at the same time will provide the best, most balanced handling and ride quality. If one shock has failed, its partner on the other side has endured the same mileage and conditions and is likely near the end of its life too.
My car sags in the back. Is it the shocks?
Yes, if you have the Automatic Level Control system, a sagging rear is the classic sign of a leak in the air shocks or a failed compressor. If you have standard suspension, sagging is usually caused by weak or broken coil springs, not the shocks themselves. Shocks dampen movement, but springs support the vehicle's weight.
I'm converting from air shocks. Which standard shocks should I get?
This depends on the ride you want. For a soft, comfortable ride similar to stock, KYB Excel-G or standard Monroe shocks are a good choice. If you want to eliminate the 'floaty' feeling and have a much firmer, more controlled ride, upgrade to Bilstein B6 or KYB Gas-A-Just shocks. Many owners who make this switch are very happy with the improved handling.
What are 'police package' shocks?
The Roadmaster shares its platform with the Chevrolet Caprice, which was widely used as a police vehicle (9C1 package). Police versions used much stiffer springs and heavy-duty shocks for high-speed stability. Aftermarket shocks listed as 'heavy-duty,' 'severe service,' or for the 'police package' (like Monroe Severe Service) will give you a very firm ride. This may be too harsh for some on rough roads.
Technical Specifications
OEM Part Numbers: 22064434 22064433 19178430 22064401 22064400
The 1990-1996 Buick Roadmaster uses a body-on-frame construction (GM B-Body Platform). The front suspension consists of independent upper and lower control arms with coil springs and separate shock absorbers. The rear suspension is a solid axle with a 4-link setup, using coil springs and shock absorbers. An optional Automatic Level Control (ALC) system was available for the rear, which utilized air-adjustable shock absorbers.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick Roadmaster:
- 🛍️ Shop This Part
- Understanding Your Roadmaster's Suspension
- Common Problems with the Rear Air Suspension
- Key Failure Points of the ALC System:
- Choosing the Right Aftermarket Shocks
- OEM vs. Aftermarket Quality
- Option 1: Replace Rear Air Shocks
- Option 2: Convert to Standard Shocks (Most Popular)
- Brand Tiers for Your Roadmaster
- Known Issues, Recalls & TSBs
- Frequently Asked Questions
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