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Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

Mystery Cadillac coupe concept revealed in patent drawings

We have been reminded once again that when Cadillac designs a coupe, it's usually spectacular. The reminder comes in the form of a patent drawing filing that was previously reported on by Jalopnik. In the filing are shots of the two-door from just about every angle, and there's not a bad one in the bunch. Unfortunately, there isn't really any other information about the car in the patent, so the car remains a mystery in that regard. Still, there's a fair amount to be gleaned from the images. It certainly looks sportier than most recent Cadillac concepts. It has a fastback roof and a short deck lid. The rear bumper has a diffuser design fitted to it. The rear fenders are very wide. It has large auxiliary grilles on each side of the center one, and the way the taillights are designed seem to hint at extractor vents. The overall proportions even look a bit like those of the Camaro, but possibly a little larger. The car also looks like it's probably a concept. The side mirror stalks are far too skinny to actually be production units. The big diffuser and center exhaust, plus those rear extractor vent designs seem a little much for a production model, too. The headlights are also a little on the small side. Being a concept (probably), we're a little worried. We really want to see this thing come to market, but Cadillac has a bad track record of showing beautiful concepts that never make it to production, even when they aren't particularly over-the-top. The Elmiraj and Ciel are two that come to mind. The former was a coupe, too, and was elegant and grounded. We never got a production version of either. We did see some styling inspiration from the Elmiraj on the ATS and CTS, but they never quite captured the concept's beauty. Then again, when Cadillac has managed to bring a recent concept to production, the results haven't great. The Converj concept became the ELR, and while the styling came through fine, it was hampered by an uninspiring powertrain and an excruciating price tag. But hey, Cadillac could always prove us wrong. And we would like them to. Related Video: Featured Gallery Cadillac Coupe Patent Drawings News Source: U.S. Patent and Trademark OfficeImage Credit: U.S. Patent and Trademark Office Cadillac Coupe Concept Cars Luxury

GM recalls 3.8 million vehicles in North America due to braking issue

WASHINGTON — General Motors Co said Wednesday it was recalling 3.46 million U.S. pickup trucks and SUVs to address a vacuum pump issue that could make braking more difficult and that has been linked to 113 accidents and 13 injuries. The recall covers 2014-2018 model year vehicles, including some Cadillac Escalade, Chevrolet Silverado, Chevrolet Tahoe, GMC Sierra, Chevrolet Suburban and GMC Yukon vehicles. In late June, GM recalled 310,000 vehicles in Canada for the same issue. GM did not immediately explain why the Canadian recall occurred more than two months before it called back the vehicles in the United States. The recall was triggered because the amount of vacuum created by the vacuum pump may decrease over time, GM told the National Highway Traffic Safety Administration (NHTSA) in documents posted on Wednesday. The NHTSA opened a preliminary investigation into the issue last November, and said it had reports of nine related crashes and two injuries. It provided GM in July with additional field reports that prompted the automaker to open an investigation. GM said it could affect braking in "rare circumstances." The NHTSA said in a statement the "vehicles may experience brake boost failure, which would require increased brake pedal effort, leading to a hard brake pedal feel, and potentially increased stopping distance." GM said dealers will reprogram the electronic brake control module to improve how the system utilizes the hydraulic brake boost assist function when vacuum assist is depleted. GM said the vacuum assist pump, which is lubricated with engine oil that flows into the pump through a filter screen, can in some cases lose effectiveness over time, as debris such as oil sludge can accumulate on the filter screen. GM told NHTSA that prior model years used a different brake assist system design, and vehicles manufactured after 2018 were not equipped with the affected pump design. Separately, GM said on Wednesday it is recalling 270,000 additional U.S. vehicles in three smaller recalls, including 177,000 2018 Chevrolet Malibu cars with 1.5L turbo engines because an error in the engine control module software may result in the fuel injectors being disabled.